Name: a modular microfluidic technology for systematic studies of colloidal semiconductor nanocrystals
Uploaded: 2018-05-10T15:00:00
Description: Watch this Scientific Journal Video about A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals at JoVE.com

Forfatterne parlamentsarbejdet den finansielle støtte fra North Carolina State University. Milad Abolhasani og Robert W. Epps anerkender taknemmeligt støtte fra UNC-muligheder forskningsinitiativ (UNC-ROI) tilskud.

1. reaktor forsamling
<img alt="Figure 1" class="xfigimg" src="/files/ftp_upload/57666/57666fig1.jpg"> Figur 1 . Trinvise illustration af en stikprøve platform samling proces. Panelerne viser en trinvis illustration af en stikprøve platform samling proces beskriver de første arrangement af oversættelse fase og optisk stillingsindehavere på montering brød bred, (ii) montering af forløber rør montering fase ...

<ol>
	<li>Tan, Z. -. K., Moghaddam, R. S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bright+light-emitting+diodes+based+on+organometal+halide+perovskite.">Bright light-emitting diodes based on organometal halide perovskite.</a> Nature Nanotechnology. 9 (9), 687-692 (2014).</li><li>Kojima, A., Teshima, K., Shirai, Y., Miyasaka, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Organometal+halide+perovskites+as+visible-light+sensitizers+for+photovoltaic+cells.">Organometal halide perovskites as visible-light sensitizers for photovoltaic cells.</a> Journal of the American Chemical Society. 131 (17), 6050-6051 (2009).</li><li>Huang, H., Bodnarchuk, M. I., Kershaw, S. V., Kovalenko, M. V., Rogach, A. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lead+halide+perovskite+nanocrystals+in+the+research+spotlight:+stability+and+defect+tolerance.">Lead halide perovskite nanocrystals in the research spotlight: stability and defect tolerance.</a> ACS Energy Letters. 2 (9), 2071-2083 (2017).</li><li>Gr&#228;tzel, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+light+and+shade+of+perovskite+solar+cells.">The light and shade of perovskite solar cells.</a> Nature Materials. 13, 838 (2014).</li><li>Schmidt, L. C., Perteg&#225;s, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Nontemplate+synthesis+of+CH3NH3PbBr3+perovskite+nanoparticles.">Nontemplate synthesis of CH3NH3PbBr3 perovskite nanoparticles.</a> Journal of the American Chemical Society. 136 (3), 850-853 (2014).</li><li>Wei, S., Yang, Y., Kang, X., Wang, L., Huang, L., Pan, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Room-temperature+and+gram-scale+synthesis+of+CsPbX3+(X+=+Cl,+Br,+I)+perovskite+nanocrystals+with+50-85%+photoluminescence+quantum+yields.">Room-temperature and gram-scale synthesis of CsPbX3 (X = Cl, Br, I) perovskite nanocrystals with 50-85% photoluminescence quantum yields.</a> Chemical Communications. 52 (45), 7265-7268 (2016).</li><li>Vybornyi, O., Yakunin, S. V., Kovalenko, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Polar-solvent-free+colloidal+synthesis+of+highly+luminescent+alkylammonium+lead+halide+perovskite+nanocrystals.">Polar-solvent-free colloidal synthesis of highly luminescent alkylammonium lead halide perovskite nanocrystals.</a> Nanoscale. 8 (12), 6278-6283 (2016).</li><li>Sun, S., Yuan, D., Xu, Y., Wang, A., Deng, Z. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ligand-mediated+synthesis+of+shape-controlled+cesium+lead+halide+perovskite+nanocrystals+via+reprecipitation+process+at+room+temperature.">Ligand-mediated synthesis of shape-controlled cesium lead halide perovskite nanocrystals via reprecipitation process at room temperature.</a> ACS Nano. 10 (3), 3648-3657 (2016).</li><li>Jellicoe, T. C., Richter, J. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synthesis+and+optical+properties+of+lead-free+cesium+tin+halide+perovskite+nanocrystals.">Synthesis and optical properties of lead-free cesium tin halide perovskite nanocrystals.</a> Journal of the American Chemical Society. 138 (9), 2941-2944 (2016).</li><li>Tong, Y., Bladt, E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Highly+luminescent+cesium+lead+halide+perovskite+nanocrystals+with+tunable+composition+and+thickness+by+ultrasonication.">Highly luminescent cesium lead halide perovskite nanocrystals with tunable composition and thickness by ultrasonication.</a> Angewandte Chemie International Edition. 55 (44), 13887-13892 (2016).</li><li>Zhang, D., Eaton, S. W., Yu, Y., Dou, L., Yang, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Solution-phase+synthesis+of+cesium+lead+halide+perovskite+nanowires.">Solution-phase synthesis of cesium lead halide perovskite nanowires.</a> Journal of the American Chemical Society. 137 (29), 9230-9233 (2015).</li><li>Lignos, I., Stavrakis, S., Nedelcu, G., Protesescu, L., deMello, A. J., Kovalenko, M. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synthesis+of+cesium+lead+halide+perovskite+nanocrystals+in+a+droplet-based+microfluidic+platform:+fast+parametric+space+mapping.">Synthesis of cesium lead halide perovskite nanocrystals in a droplet-based microfluidic platform: fast parametric space mapping.</a> Nano Letters. 16 (3), 1869-1877 (2016).</li><li>Wei, S., Yang, Y., Kang, X., Wang, L., Huang, L., Pan, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Room-temperature+and+gram-scale+synthesis+of+CsPbX3+(X+=+Cl,+Br,+I)+perovskite+nanocrystals+with+50-85%+photoluminescence+quantum+yields.">Room-temperature and gram-scale synthesis of CsPbX3 (X = Cl, Br, I) perovskite nanocrystals with 50-85% photoluminescence quantum yields.</a> Chemical Communications. 52 (45), 7265-7268 (2016).</li><li>Protesescu, L., Yakunin, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Nanocrystals+of+cesium+lead+halide+perovskites+(CsPbX+3+,+X+=+Cl,+Br,+and+I):+novel+optoelectronic+materials+showing+bright+emission+with+wide+color+gamut.">Nanocrystals of cesium lead halide perovskites (CsPbX 3 , X = Cl, Br, and I): novel optoelectronic materials showing bright emission with wide color gamut.</a> Nano Letters. 15 (6), 3692-3696 (2015).</li><li>Epps, R. W., Felton, K. C., Coley, C. W., Abolhasani, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Automated+microfluidic+platform+for+systematic+studies+of+colloidal+perovskite+nanocrystals:+towards+continuous+nano-manufacturing.">Automated microfluidic platform for systematic studies of colloidal perovskite nanocrystals: towards continuous nano-manufacturing.</a> Lab Chip. 23 (17), 4040-4047 (2017).</li><li>Lignos, I., Protesescu, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Facile+droplet-based+microfluidic+synthesis+of+monodisperse+IV-VI+semiconductor+nanocrystals+with+coupled+in-line+NIR+fluorescence+detection.">Facile droplet-based microfluidic synthesis of monodisperse IV-VI semiconductor nanocrystals with coupled in-line NIR fluorescence detection.</a> Chemistry of Materials. 26 (9), 2975-2982 (2014).</li><li>Park, J., Saffari, A., Kumar, S., G&#252;nther, A., Kumacheva, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microfluidic+synthesis+of+polymer+and+inorganic+particulate+materials.">Microfluidic synthesis of polymer and inorganic particulate materials.</a> Annual Review of Materials Research. 40 (1), 415-443 (2010).</li><li>Phillips, T. W., Lignos, I. G., Maceiczyk, R. M., deMello, A. J., deMello, J. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Nanocrystal+synthesis+in+microfluidic+reactors:+where+next.">Nanocrystal synthesis in microfluidic reactors: where next.</a> Lab on a Chip. 14 (17), 3172-3180 (2014).</li><li>Lignos, I., Stavrakis, S., Kilaj, A., deMello, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Millisecond-timescale+monitoring+of+PBS+nanoparticle+nucleation+and+growth+using+droplet-based+microfluidics.">Millisecond-timescale monitoring of PBS nanoparticle nucleation and growth using droplet-based microfluidics.</a> Small. 11 (32), 4009-4017 (2015).</li><li>Abolhasani, M., Coley, C. W., Xie, L., Chen, O., Bawendi, M. G., Jensen, K. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Oscillatory+microprocessor+for+growth+and+in+situ.+characterization+of+semiconductor+nanocrystals.">Oscillatory microprocessor for growth and in situ. characterization of semiconductor nanocrystals.</a> Chemistry of Materials. 27 (17), 6131-6138 (2015).</li><li>Chen, D. L., Gerdts, C. J., Ismagilov, R. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Using+microfluidics+to+observe+the+effect+of+mixing+on+nucleation+of+protein+crystals.">Using microfluidics to observe the effect of mixing on nucleation of protein crystals.</a> Journal of the American Chemical Society. 127 (27), 9672-9673 (2005).</li></ol>

Automatiseret prøveudtagningssystemet: De autonome drift af screening platform er udført med en central kontrol finite stat machine. Bevægelse mellem disse stater opstår fortløbende med flere rekursive segmenter til Tillad for drift af et varierende antal udtagningsvilkårene. Den generelle ordning kontrol kan opdeles i 3 core faser. Først, systemet begynder med en initialisering skridt, som fastlægger kommunikation gennem hver USB-kontrollerede komponent, automatisk definerer fil gemmer stier, og...

Fremkomsten af halvleder-nanokrystaller, især quantum dots, har drevet betydelige fremskridt i elektroniske materialeforskning og produktion. Quantum dot lysdioder1 er allerede blevet gennemført i kommercielt tilgængelige "QLED" viser f.eks. For nylig har perovskites blandt denne klasse af halvledere udløste væsentlig interesse og forskning mod høj effektivitet og lave omkostninger PV teknologier. Siden den første demonstration af en perovskite-baseret PV i 2009 steget2 lab-skala magt konverteringseffektivitet på perovskite-baserede solceller til en uovertruffen af nogen PV technology i historie. 3 , 4 ud over den drivende interesse i perovskite-baserede PVs, en række nylige metoder beskriver facile kolloid syntesen af perovskite nanokrystaller har skabt mulighed for lavpris-løsning-fase behandling af perovskite QDs i kommerciel elektronik. 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14
I indsatsen mod storstilede nanoproduktion af kolloid perovskite QDs, skal en bedre grundlæggende forståelse af nanocrystal vækst veje og en effektiv kontrol af reaktionsbetingelser først udvikles. Eksisterende undersøgelser af disse processer har dog traditionelt påberåbt kolbe-baserede tilgange. Batch syntese strategier præsentere en række iboende begrænsninger med hensyn til materielle karakterisering og produktion, men mest markant kolbe-baserede teknikker er meget ineffektiv i screening forbrug af tid og forløber, og demonstrere kolbe størrelse-afhængige masse overførsel egenskaber, som hæmmer syntesen konsistens. 15 for at studere effektivt vækst veje af kolloid halvleder-nanokrystaller på tværs af det store udvalg af rapporterede synteser procedurer og inden for den brede relevante udsnit plads, en mere effektiv screening teknik er påkrævet. I de seneste to årtier, en række mikrofluid strategier er udviklet til undersøgelser af kolloid nanokrystaller udnytte de væsentligt lavere kemiske forbrug, tilgængelighed af high throughput screening-metoder og potentiale for en proces kontrol gennemførelse i kontinuerlig syntese systemer. 12 , 16 , 17 , 18 , 19 , 20
I dette arbejde rapport vi design og udvikling af en automatiseret mikrofluid platform for høj overførselshastighed i situ studier af kolloid halvleder-nanokrystaller. En roman, oversætte flow celle, en yderst modulære design og integrationen af off-the-shelf rørformede reaktorer og fluidic forbindelser udgør en unik og fleksibel omkonfigurerbare platform med direkte ansøgninger i opdagelsen, screening og optimering af kolloid nanokrystaller. Capitalizing på translationel evne til vores opdagelse teknik (dvs., en tre-port flow celle), for første gang, vise vi systematisk afkobling af blanding og reaktion tidsskalaer, mens samtidig forbedrer prøveudtagning effektivitet og samling priser over traditionelle stationære flow celle tilgange. Udnyttelsen af denne platform giver høj overførselshastighed og præcis band-gap engineering af kolloid nanocrystal synteser mod kontinuerlig nanoproduktion strategier.

<table border="0" cellpadding="0" cellspacing="0" style="width:888px;" width="888">
	<colgroup>
		<col />
		<col />
		<col />
		<col />
	</colgroup>
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Toluene</td>
			<td style="width:191px;">Fisher Scientific</td>
			<td style="width:168px;">AC364410010</td>
			<td style="width:257px;">99.85% extra over molecular sieves</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Oleic acid</td>
			<td style="width:191px;">Sigma Aldrich</td>
			<td style="width:168px;">364525&#160;ALDRICH</td>
			<td>technical grade 90%</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Cesium hydroxide (50 wt% in water)</td>
			<td style="width:191px;">Sigma Aldrich</td>
			<td style="width:168px;">232041 ALDRICH</td>
			<td>50 wt% in water &#62; 99.9% trace metals</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Lead(II) oxide</td>
			<td style="width:191px;">Sigma Aldrich</td>
			<td style="width:168px;">211907 SIGMA-ALDRICH</td>
			<td>&#62; 99.9% trace metals basis</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Tetraoctylammonium bromide</td>
			<td style="width:191px;">Sigma Aldrich</td>
			<td style="width:168px;">294136 ALDRICH</td>
			<td>98%</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">1/16&#34; OD, 0.04&#34; ID FEP tubing</td>
			<td style="width:191px;">MicroSolv</td>
			<td style="width:168px;">48410-40</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">1/16&#34; OD, 0.02&#34; ID ETFE tubing</td>
			<td style="width:191px;">MicroSolv</td>
			<td style="width:168px;">48510-20</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">0.02&#34; thru hole PEEK Tee</td>
			<td style="width:191px;">IDEX Health &#38; Science</td>
			<td style="width:168px;">P-712</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">1/4-28 ETFE flangeless ferrule for 1/16&#34;</td>
			<td style="width:191px;">IDEX Health &#38; Science</td>
			<td style="width:168px;">P-200N</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">1/4-28 PEEK flangeless nut for 1/16&#34;</td>
			<td style="width:191px;">IDEX Health &#38; Science</td>
			<td style="width:168px;">P-230</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">4-way PEEK L-valve</td>
			<td style="width:191px;">IDEX Health &#38; Science</td>
			<td style="width:168px;">V-100L</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Syringe pump</td>
			<td style="width:191px;">Harvard Apparatus</td>
			<td style="width:168px;">70-3007</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">8 mL stainless steel syringe</td>
			<td style="width:191px;">Harvard Apparatus</td>
			<td style="width:168px;">70-2267</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">25 mL glass syringe</td>
			<td style="width:191px;">Scientific Glass Engineering</td>
			<td style="width:168px;">25MDF-LL-GT</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Optical breadboard</td>
			<td style="width:191px;">ThorLabs</td>
			<td style="width:168px;">MB1224</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">300 mm translation stage</td>
			<td style="width:191px;">ThorLabs</td>
			<td style="width:168px;">LTS300</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Optical post</td>
			<td style="width:191px;">ThorLabs</td>
			<td style="width:168px;">TR2-4</td>
			<td>TR2, TR3, or TR4</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Optical post holder</td>
			<td style="width:191px;">ThorLabs</td>
			<td style="width:168px;">PH4-6</td>
			<td>PH4 or PH6</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">365 nm LED</td>
			<td style="width:191px;">ThorLabs</td>
			<td style="width:168px;">M365LP1</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">LED driver</td>
			<td style="width:191px;">ThorLabs</td>
			<td style="width:168px;">LEDD1B</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">600 micron patch cord</td>
			<td style="width:191px;">Ocean Optics</td>
			<td style="width:168px;">QP600-1-SR</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Deuterium-halogen light source</td>
			<td style="width:191px;">Ocean Optics</td>
			<td style="width:168px;">DH-2000-BAL</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Miniature spectrometer</td>
			<td style="width:191px;">Ocean Optics</td>
			<td style="width:168px;">FLAME-S-XR1-ES</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Multifuction I/O device (DAQ)</td>
			<td style="width:191px;">National Instruments</td>
			<td style="width:168px;">USB-6001</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:272px;">Virtual Instrument Software</td>
			<td style="width:191px;">National Instruments</td>
			<td style="width:168px;">LabVIEW 2015 SP1</td>
			<td></td>
		</tr>
	</tbody>
</table>

a modular microfluidic technology for systematic studies of colloidal semiconductor nanocrystals

Kolloid halvleder-nanokrystaller, kendt som quantum dots (QDs), er en hastigt voksende klasse af materialer i kommercielle elektronik, såsom lys emitting dioder (lysdioder) og solcelleenergi (PVs). Blandt dette materiale gruppe, har uorganisk/organisk perovskites vist betydelig forbedring og potentiale mod høj effektivitet, lave omkostninger PV fabrikation på grund af deres høje ladning carrier jobmobiliteten og levetid. Trods mulighederne for perovskite QDs i stor skala PV og LED applikationer, har manglen grundlæggende og omfattende forståelse af deres vækst veje hæmmet deres tilpasning inden for kontinuerlig nanoproduktion strategier. Traditionelle kolbe-baseret screening tilgange er generelt dyre, arbejdskrævende og upræcise for effektivt kendetegner de brede parameter plads og syntese forskellige relevante kolloid QD reaktioner. I dette arbejde, er en fuldstændig autonom mikrofluid platform udviklet systematisk undersøge den store parameter plads forbundet med kolloid syntesen af nanokrystaller i en kontinuerlig strøm format. Gennem anvendelse af en roman, oversætte tre-port flow celle og modular reactor forlængelse enheder, kan systemet hurtigt indsamle fluorescens og absorptionsspektre på tværs af reaktoren længder lige 3-196 cm. Justerbar reaktor længde ikke kun decouples opholdstid fra velocity-afhængige masse overførsel, det forbedrer også væsentligt prøveudtagning priser og kemiske forbrug på grund af karakterisering af 40 unikke spektre inden for en enkelt afbalancerede system. Prøve satser kan nå op til 30.000 unikke spektre pr. dag, og betingelserne, der dækker 4 størrelsesordener i residence gange lige 100 ms - 17 min. Yderligere anvendelser af dette system ville væsentligt forbedre hastighed og præcision af den materielle opdagelse og screening i fremtidige undersøgelser. Detaljeret i denne betænkning er system materialer og forsamling protokoller med en generel beskrivelse af den automatiske prøvetagning software og offline databehandling.

Prøve spektre: Udnytte den omtalte mikrofluid platform, Nukleering og vækst stadier af kolloid halvleder-nanokrystaller syntese temperatur kan direkte studeres ved at overvåge tid-udviklingen af absorption og fluorescens-spektre af den dannede nanokrystaller under ensartet blanding betingelser. Figur 5 A viser et eksempel sæt af spektre fremstillet inden for en enkelt pass af cellen tre-port flow. Mens emission bølgelæn...

Watch this Scientific Journal Video about A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals at JoVE.com

A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals

Detaljeret heri er protokollerne drift og montage af en modulær mikrofluid screening platform for systematisk karakterisering af kolloid semiconductor nanocrystal synteser. Gennem fuldt justerbare system arrangementer, kan højeffektive spectra samling foretages på tværs af 4 størrelsesordener reaktionstid skalaer inden for en masse overførsel-kontrollerede prøveudtagning.

En modulær mikrofluid teknologi for systematiske undersøgelser af kolloid halvleder-nanokrystaller

Colloidal semiconductor nanocrystals, known as quantum dots (QDs), are a rapidly growing class of materials in commercial electronics, such as light ...

Research

JoVE Journal

Engineering

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

Høst Solar energi ved hjælp af Charge-separerende nanokrystaller og deres Solids

Conjoining different semiconductor materials in a single nano-composite provides synthetic means for the development of novel optoelectronic materials ...

Scalable Nanohelices for Predictive Studies and Enhanced 3D Visualization

Skalerbar Nanohelices for Predictive Studier og Udvidet 3D-visualisering

Spring-like materials are ubiquitous in nature and of interest in nanotechnology for energy harvesting, hydrogen storage, and biological sensing ...

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Silicium-oxid-halvleder Quantum Dots for Single-elektron Pumpning

As mass-produced silicon transistors have reached the nano-scale, their behavior and performances are increasingly affected, and often deteriorated, by ...

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Ohmsk Kontakt Fabrication Ved hjælp af en Fokuseret-ion Beam Teknik og elektrisk karakterisering for Layer Semiconductor nanostrukturer

Layer semiconductors with easily processed two-dimensional (2D) structures exhibit indirect-to-direct bandgap transitions and superior transistor ...

Fabrication of Low Temperature Carbon Nanotube Vertical Interconnects Compatible with Semiconductor Technology

Fabrikation af lav temperatur kulstof nanorør Lodrette Interconnect Kompatibel med Semiconductor Technology

We demonstrate a method for the low temperature growth (350 &#176;C) of vertically-aligned carbon nanotubes (CNT) bundles on electrically conductive ...

Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets

Kapillær-baserede Centrifugal mikrofluidanordning for Size-styrbar Dannelse monodisperse Mikrodråber

Here, we demonstrate a simple method for the rapid production of size-controllable, monodisperse, W/O microdroplets using a capillary-based centrifugal ...

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Omfattende karakterisering af Extended Fejl i Semiconductor Materials af en Scanning Electron Microscope

Extended defects such as dislocations and grain boundaries have a strong influence on the performance of microelectronic devices and on other applications ...

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Kolloid Syntese af Nanopatch Antenner for Applications i Plasmonics og Nanofotonik

We present a method for colloidal synthesis of silver nanocubes and the use of these in combination with a smooth gold film, to fabricate plasmonic ...

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Oprettelse Sub-50 Nm Nanofluidic vejkryds i PDMS Mikrofluid Chip via Self-Assembly Processen med Kolloid Partikler

Polydimethylsiloxane (PDMS) is the prevailing building material to make microfluidic devices due to its ease of molding and bonding as well as its ...

Solvent Bonding for Fabrication of PMMA and COP Microfluidic Devices

Opløsningsmiddel Bonding til Fabrikation af PMMA og COP mikrofluidenheder

Thermoplastic microfluidic devices offer many advantages over those made from silicone elastomers, but bonding procedures must be developed for each ...