Name: synthesis of substrate-bound au nanowires via an active surface growth mechanism
Uploaded: 2018-07-18T15:00:00
Description: Watch this Scientific Journal Video about Synthesis of Substrate-Bound Au Nanowires Via an Active Surface Growth Mechanism at JoVE.com

Vi erkjenner takknemlig økonomisk støtte fra National Natural Science Foundation i Kina (21703104), Jiangsu vitenskap og teknologi Plan (SBK2017041514) Nanjing Tech University (39837131) og SICAM fellesskap fra Jiangsu nasjonale Synergetic Innovasjon senter for avanserte materialer.

Forsiktig: Kontroller de Studer Produktdatablad (MSDS) av kjemikaliene for detaljert instruksjoner for håndtering og oppbevaring. Vær forsiktig ved håndtering nanomaterialer, som det kan være uidentifisert risiko. Vennligst utføre eksperimenter i avtrekksvifte og bruke riktig personlig verneutstyr.
1. syntese av frø nanopartikler
Merk: For å unngå feil forårsaket av det tidlig nucleation under hydrogenion syntese, vask baren glass og rør brukes i syntese med...

<ol>
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Mekanismen for denne aktive overflaten veksten styrt nanowire syntese har vært diskutert grundig i tidligere arbeid19. I tillegg har effekten av seedet papirstørrelser og typer samt effekten av ligand typer og størrelser også vært undersøkt20,21. Generelt. nanowire veksten er svært forskjellig fra tidligere rapporterte ruter. Ingen mal er nødvendig, og asymmetriske veksten er indusert av forskjellene mellom ligand snødekte Au over...

Typisk for en dimensjonal nanomaterialer, nanowires har både bulk-relaterte egenskapene og unike egenskaper stammer fra quantum effekten av nanoskala strukturen. Som en bro mellom nanoskala og bulk skala materiale, har de vært mye brukt i ulike katalyse, sensing og nanoelectronic enheter, etc. 1 , 2 , 3.
Men har syntese av nanowires lenge vært en stor utfordring, som det krever vanligvis bryte den iboende symmetrien i krystaller. Tradisjonelt er en mal ansatt å regulere avsetning av materialer. For eksempel, har mal-elektrodeposisjon blitt brukt for dannelsen av forskjellige typer nanowires som Ag nanowires og CDer nanowires4,5,6,7,8,9 ,10. En annen felles tilnærming er damp-flytende-solid (Missiler) vekst, som benytter en smeltet katalysator å indusere Anisotrop veksten på underlaget på en høy temperatur11. Felles strategier for syntese av metall nanowires er polyol metoder for Ag nanowires og oleylamine-assistert ultrathin Au nanowires12,13,14,15. Begge tilnærminger er materiale-spesifikke parameterne nanowire stilles ikke lett under syntese. I tillegg kan metall nanowires også dannes av press-drevet metoden, der de monterte metall nanopartikler er mekanisk komprimert og smeltet sammen til nanowires16,17,18.
Nylig rapportert vi en særegen metode til syntese Au nanowires19. Med hjelp av en thiolated små molekyl ligand, kunne nanowires vokse og danner et vertikalt tilordnete utvalg på meste Si wafer substrat på omgivelsesforhold. Det ble funnet at ligander spiller en viktig rolle i symmetri grensesprengende veksten. Det binder seg til overflaten av underlaget-adsorbert Au frøene sterkt, tvinge Au innskudd selektivt på ligand-mangelfull grensesnittet mellom frø og underlaget. Grensesnittet mellom nylig avsatt Au og underlaget forblir ligand mangelfull, derfor den aktive overflaten finnes gjennom hele veksten. Ved tuning ligand konsentrasjonen, hvilken frø og konsentrasjon, samt flere andre parametere, kan en rekke Au nanowire-baserte nanostrukturer bli syntetisert.
I dette arbeidet, vil vi gi en detaljert protokoll for denne praktisk Au nanowires syntese. Avledede syntese er også presentert, inkludert syntesen av Au nanowires hydrofobe overflaten eiendom, Au nanowires på andre substrater konisk Au nanowires ved å blande to ligander og nanowire-baserte Au nanostrukturer dannet av tuning veksten forhold.

<table border="0" cellpadding="0" cellspacing="0" width="846">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:256px;">Trisodium citrate dihydrate</td>
			<td style="width:209px;">Alfa Aesar</td>
			<td style="width:179px;">LoT: 5008F14U</td>
			<td style="width:203px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sodium borohydride</td>
			<td style="width:209px;">Fluka</td>
			<td style="width:179px;">LoT: STBG0330V</td>
			<td>NaBH4</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Hydrogen tetrachloroaurate(III) trihydrate</td>
			<td style="width:209px;">Alfa Aesar</td>
			<td style="width:179px;">LoT: T19C006</td>
			<td style="width:203px;">HAuCl4</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">3-aminopropyltriethoxysilane</td>
			<td style="width:209px;">J&#38;K Scientific</td>
			<td style="width:179px;">LoT: LT20Q102</td>
			<td style="width:203px;">APTES</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">L-ascorbic acid&#160;</td>
			<td>Sigma-Aldrich</td>
			<td style="width:179px;">LoT: SLBL9227V</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">4-mercaptobenzoic acid</td>
			<td>Sigma-Aldrich</td>
			<td style="width:179px;">LoT: MKBV5048V</td>
			<td style="width:203px;">4-MBA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">2-Naphthalenethiol</td>
			<td>Sigma-Aldrich</td>
			<td style="width:179px;">LoT: BCBP4238V</td>
			<td>2-NpSH</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">4-Mercaptophenylacetic acid</td>
			<td style="width:209px;">Alfa Aesar</td>
			<td style="width:179px;">LoT: 10199160</td>
			<td>4-MPAA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">3-mercaptobenzoic acid</td>
			<td style="width:209px;">Aladdin</td>
			<td style="width:179px;">LoT: G1213027</td>
			<td>3-MBA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">3-Mercaptopropionic acid</td>
			<td style="width:209px;">Aladdin</td>
			<td style="width:179px;">LoT: E1618095</td>
			<td>3-MPA</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">absolute ethanol</td>
			<td style="width:209px;">Sinopharm chemical Reagent</td>
			<td style="width:179px;">20170802</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:256px;">Silicon wafer</td>
			<td style="width:209px;">Zhe Jiang lijing</td>
			<td style="width:179px;">P</td>
			<td>Si</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Scanning Electron Microscope</td>
			<td style="width:209px;">Quanta FEG 250</td>
			<td style="width:179px;"></td>
			<td>SEM</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Centrifuge&#160;</td>
			<td style="width:209px;">Eppendorf</td>
			<td style="width:179px;">5424</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Ultrasonic cleaner&#160;</td>
			<td style="width:209px;">Kun Shan hechuang</td>
			<td style="width:179px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:256px;">Ultra-pure water system</td>
			<td style="width:209px;">NanJing qianyan</td>
			<td style="width:179px;">UP6682-10-11</td>
			<td>for deionized water</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:256px;">Plasma cleaner</td>
			<td style="width:209px;">Harrick Plasma</td>
			<td style="width:179px;">PDC-002</td>
			<td>for oxygen plasma</td>
		</tr>
	</tbody>
</table>

synthesis of substrate-bound au nanowires via an active surface growth mechanism

Fremme syntetiske evner er viktig for utviklingen av nanovitenskap og nanoteknologi. Syntese av nanowires har alltid vært en utfordring, fordi den krever asymmetrisk vekst av symmetrisk krystaller. Her rapporterer vi en særegen syntese av underlaget-bundet Au nanowires. Denne malen-fri syntese benytter thiolated ligander og underlaget adsorpsjon å oppnå kontinuerlig asymmetrisk avsetning av Au i løsning på forholdene. Thiolated ligand forhindret Au avsetning på utsatte overflaten av frø, så Au avsetning oppstår bare på grensesnittet mellom Au frø og underlaget. Siden av den nylig avsatt Au nanowires dekkes umiddelbart med thiolated ligand, mens bunnen mot underlaget er ligand-fri og aktiv for neste runde av Au deponering. Videre viser vi at denne Au nanowire vekst kan bli indusert på ulike underlag, og forskjellige thiolated ligander kan brukes til å regulere overflatekjemi av nanowires. Diameteren på nanowires kan også styres med blandet ligander, som en "dårlig" ligand kunne snu lateral veksten. Med forståelsen av mekanismen, kan Au nanowire-baserte nanostrukturer designet og syntetisert.

Au hydrogenion frø, substrat-bundet Au nanowires og Au nanowire-baserte avledede nanostrukturer kjennetegnes med SEM. figur 1 viser representant SEM bilder av 3-5 nm Au nanopartikler, 15 nm Au nanopartikler og 40 nm Au nanopartikler adsorbert på Si kjeks, bekrefter deres størrelser, adsorpsjon og distribusjon. Au nanowires vokst fra respektive frø på Si wafer underlaget er også presentert. Representant SEM bilder av typiske Au nanowires substrater enn d...

Watch this Scientific Journal Video about Synthesis of Substrate-Bound Au Nanowires Via an Active Surface Growth Mechanism at JoVE.com

Synthesis of Substrate-Bound Au Nanowires Via an Active Surface Growth Mechanism

Vi rapporterer en løsning-basert metode å syntetisere substrat-bundet Au nanowires. Ved å justere de molekylære ligander brukes under syntese, kan Au nanowires dyrkes fra ulike underlag med ulike overflate egenskaper. Au nanowire-baserte nanostrukturer kan også syntetiseres av justere parameterne reaksjon.

Syntese av underlaget-bundet Au Nanowires Via en aktiv overflate vekst mekanisme

Advancing synthetic capabilities is important for the development of nanoscience and nanotechnology. The synthesis of nanowires has always been a ...

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