Ag Nanoparticle-Induced Oxidative Dimerization of Thiophenols: Efficiency and Mechanism

Langmuir : the ACS Journal of Surfaces and Colloids
Huanhuan LiYingcui Fang

Abstract

By oxidation of silver nanoparticles (AgNPs) in two ways: thermal oxidation (TO) in molecular oxygen and cool oxidation in oxygen plasma (i.e., oxygen plasma irradiation, OPI), the efficiency and mechanism of visible light-induced selective transformation of 4-aminothiophenol (PATP) to 4,4'-dimercaptoazobenzene (DMAB) on the surface of AgNPs was explored. On the basis of the evolution of surface-enhanced Raman scattering (SERS) spectrum of PATP (10-5 M in ethanol) with the oxidation time, it can be concluded that OPI could improve the selective transformation efficiency (η) effectively, by 87 times for only 2 s; whereas TO could improve η conditionally, increasing at first and then decreasing gradually to zero. The results imply that silver oxide is not the root cause of the increased η. Combined with the results of SERS of oxygen species on the surface of AgNPs processed by the above-mentioned two ways, superoxide (O2-) and electrophilic oxygen atoms (O-) are suggested to be responsible for this selective transformation. Our study deepens the understanding of the mechanism of plasmonic photocatalysis and the role of silver oxide in selection transformation of organic molecules.

References

Apr 28, 2009·Physical Review Letters·Y DuI Lyubinetsky
Jun 24, 2010·Chemical Society Reviews·Peter R Ogilby
May 24, 2011·Nature Chemistry·Phillip ChristopherSuljo Linic
Sep 11, 2014·Chemical Communications : Chem Comm·Dmitry B UshakovPeter H Seeberger
Jun 29, 2016·Journal of the American Chemical Society·Ning ZhangYujie Xiong
Oct 20, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Weihua LinMengtao Sun

❮ Previous
Next ❯

Citations

Sep 19, 2019·Nature Nanotechnology·Nathan C LindquistAlexandre G Brolo
Aug 6, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Yiyuan ZhangPeijie Wang
Mar 3, 2020·ACS Applied Materials & Interfaces·Wenkai LiangLin Jiang

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.