NDLI: The role of OH<sup>−</sup> in the formation of highly selective gold nanowires at extreme pH: multi-fold enhancement in the rate of the catalytic reduction reaction by gold nanowires

Content Provider	Royal Society of Chemistry (RSC)
Author	Kurdi, Riham El Patra, Digambara
Copyright Year	2017
Abstract	There is a quest to understand the mechanism governing the morphology and geometry control of the particle growth of nanomaterials for their optical and catalytic applications. In the available literature, the role of OH− in dictating the size and shape of Au nanowires is unknown. As one of the first examples, herein, we explore how excess OH− ions in CTAB micelles play a significant role during the highly selective formation of gold nanowires having controlled diameters of ∼20–25 nm and length >1 μm, by reducing Au3+ to Au0 in a one pot, simple synthesis procedure in the presence of Ag+ ions. At pH 4–11, the same procedure does not harvest Au NWs, but Au NPs of diameter 50–70 nm, indicating that excess OH− is needed for nanowire formation. XRD, TGA, DSC, EDX, FT-IR and fluorescence spectroscopic analysis confirm that both CTAB and curcumin act as capping and stabilizing agents for Au NWs as well as Au NPs – there is no remarkable difference in the curcumin/CTAB content between Au NWs and NPs prepared in different pH environments. However, changing the CTAB micellar media to DPPC liposome media inhibits the formation of nanowires at pH ∼13; the growth of the Au NPs diminishes in DPPC liposomes, offering smaller NPs of diameter ∼25 to 30 nm, suggesting that the role of CTAB is necessary in nanowire formation. The rate of NW formation has been found to be 0.13 h−1 and the growth mechanism advocates elongation in the [110] facet of Au [110] as opposed to the [100] or [111] facets. Curcumin capped Au nanowires serve as excellent nano-catalysts for the reduction of nitro-compounds and the rate of reduction of 4-nitrophenol, a model compound, by curcumin capped Au NWs is found to be ∼10 fold higher, compared to Au NPs, which signifies that catalytic activities can be dictated by the size and shape of Au NPs.
Starting Page	5077
Ending Page	5090
Page Count	14
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	7
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c6cp08607a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Fluorescence Micelle Liposome Nanomaterials Fourier-transform infrared spectroscopy CTAB Molecular geometry X-ray crystallography 4-Nitrophenol DSC Micrometre Nanowire Curcumin Dipalmitoylphosphatidylcholine
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

ZnO nanowire-immobilized paper matrices for visible light-induced antibacterial activity against Escherichia coli

Fluorescence Signal Enhancement in Antibody Microarrays Using Lightguiding Nanowires

Synthesis of ultrathin PtPdBi nanowire and its enhanced catalytic activity towards p-nitrophenol reduction

A new fluorescent sensor for detecting p-nitrophenol based on β-cyclodextrin-capped ZnO quantum dots

Review metallic nanomaterials for sensitivity enhancement of fluorescence detection.

Gold Nanowire-network Structure Prepared from Metallic Gold Nanowires Deposited in Polycarbonate Template Membrane

729 Gold Nanowire-network Structure Prepared from Metallic Gold Nanowires Deposited in Polycarbonate Template Membrane

Facile phyto-mediated synthesis of gold nanoparticles using Eupatorium odoratum leaf extract and its size-dependent catalytic activity

Distance-Dependent Fluorescence Resonance Energy Transfer Enhancement on Nanoporous Gold

The role of OH⁻ in the formation of highly selective gold nanowires at extreme pH: multi-fold enhancement in the rate of the catalytic reduction reaction by gold nanowires

Similar Documents

ZnO nanowire-immobilized paper matrices for visible light-induced antibacterial activity against Escherichia coli

Fluorescence Signal Enhancement in Antibody Microarrays Using Lightguiding Nanowires

Synthesis of ultrathin PtPdBi nanowire and its enhanced catalytic activity towards p-nitrophenol reduction

A new fluorescent sensor for detecting p-nitrophenol based on β-cyclodextrin-capped ZnO quantum dots

Review metallic nanomaterials for sensitivity enhancement of fluorescence detection.

Gold Nanowire-network Structure Prepared from Metallic Gold Nanowires Deposited in Polycarbonate Template Membrane

729 Gold Nanowire-network Structure Prepared from Metallic Gold Nanowires Deposited in Polycarbonate Template Membrane

Facile phyto-mediated synthesis of gold nanoparticles using Eupatorium odoratum leaf extract and its size-dependent catalytic activity

Distance-Dependent Fluorescence Resonance Energy Transfer Enhancement on Nanoporous Gold

The role of OH− in the formation of highly selective gold nanowires at extreme pH: multi-fold enhancement in the rate of the catalytic reduction reaction by gold nanowires

The role of OH⁻ in the formation of highly selective gold nanowires at extreme pH: multi-fold enhancement in the rate of the catalytic reduction reaction by gold nanowires