Label‐free SERS monitoring of hydride reduction catalyzed by Au nanostars

Abstract

Surface‐enhanced Raman scattering (SERS) is a promising molecular spectroscopic technique to study chemical reactions catalyzed by nobel metal nanoparticles. Herein, the Au nanostar (NS)‐catalyzed hydride reduction of 4‐nitrothiophenol to 4‐aminothiophenol chemisorbed at the metal/solution interface was followed by SERS. By developing a simple two‐step route, we demonstrated shape‐controlled synthesis and morphology‐dependent catalytic activity of AuNSs. The kinetic SERS monitoring of the reaction on the Au surface indicates that the catalytic activity of the AuNSs correlates with the sharpness of their tips. This is consistent with the known size‐dependent catalytic activity of small AuNPs. In contrast to the complex bifunctional nanostructures reported previously, this work shows that AuNSs are bifunctional nanostructures suitable for investigating Au‐catalyzed reactions. A proposed electron transfer mechanism explains the reduction of 4‐nitrothiophenol to 4‐aminothiophenol on AuNS tips where –NO2 groups have no direct contact with the catalyst. Copyright © 2016 John Wiley & Sons, Ltd.

Recent advances in linear and non‐linear Raman spectroscopy. Part XI

“…Koenig et al used SERS from Au nanostars as a lable‐free method to monitor hydride reduction. In contrast to the complex bifunctional nanostructures reported previously, this work shows that AuNSs are bifunctional nanostructures suitable for investigating Au‐catalyzed reactions . Liu and co‐workers studied induced SERS activity in Ag@SiO2/Ag core‐shell nanosphere arrays using a tunable interior insulator.…”

“…The Ninth International Conference on Advanced Vibrational Spectroscopy (ICAVS-9) was held in Victoria, British Columbia, Canada, from June [11][12][13][14][15][16]2017. The ICAVS conference series consists of meetings held biennially starting with ICAVS-1 in Turku, Finland, in 2001 and continuing with conferences in Nottingham, England, (ICAVS-2, 2003); Delavan, Wisconsin, USA, (ICAVS- 3,2005); Corfu, Greece, (ICAVS-4, 2007); Melbourne, Year Raman spectroscopy SERS "Biological" OR "biomedical" "Nanoparticles" OR "nanotubes" OR "graphene" "Non-linear" OR "time-resolved" "Art" OR "archaeology" "Resonance"…”

“…In contrast to the complex bifunctional nanostructures reported previously, this work shows that AuNSs are bifunctional nanostructures suitable for investigating Au-catalyzed reactions. [14] Liu and co-workers studied induced SERS activity in Ag@SiO2/Ag core-shell nanosphere arrays using a tunable interior insulator. They demonstrated a bottom-up growth of Ag@SiO 2 /Ag core-shell nanosphere arrays with tunable SiO 2 interior insulator and the optimized surface-enhanced Raman scattering (SERS) substrate based on a nanostructure performed with both high sensitivity and large-area uniformity.…”

Prof. Dr Dr h.c. Wolfgang Kiefer An appreciation of Wolfgang Kiefer on the occasion of his 75th birthday

“…These contributions submitted by scientists from several continents to JRS nicely feature a diverse range of Raman spectroscopic approaches and their broad applicability. Many of the manuscripts deal with SERS, others cover topics such as instrumental developments and the application of Raman spectroscopy on biomolecular systems and materials …”

“…These contributions submitted by scientists from several continents to JRS nicely feature a diverse range of Raman spectroscopic approaches and their broad applicability. Many of the manuscripts deal with SERS, [1][2][3][4][5][6] others cover topics such as instrumental developments [7,8] and the application of Raman spectroscopy on biomolecular systems [9][10][11][12] and materials. [13,14] Wolfgang Kiefer worked throughout his impressive scientific career on pushing the limits of Raman spectroscopy, including the development of novel instrumental techniques, together with their application in a diverse range of scientific areas.…”