Competing Activation and Deactivation Mechanisms in Photodoped Bismuth Oxybromide Nanoplates Probed by Single-Molecule Fluorescence Imaging

The Journal of Physical Chemistry Letters
Meikun ShenBryce Sadtler

Abstract

Oxygen vacancies in semiconductor photocatalysts play several competing roles, serving to both enhance light absorption and charge separation of photoexcited carriers as well as act as recombination centers for their deactivation. In this Letter, we show that single-molecule fluorescence imaging of a chemically activated fluorogenic probe can be used to monitor changes in the photocatalytic activity of bismuth oxybromide (BiOBr) nanoplates in situ during the light-induced formation of oxygen vacancies. We observe that the specific activities of individual nanoplates for the photocatalytic reduction of resazurin first increase and then progressively decrease under continuous laser irradiation. Ensemble structural characterization, supported by electronic-structure calculations, shows that irradiation increases the concentration of surface oxygen vacancies in the nanoplates, reduces Bi ions, and creates donor defect levels within the band gap of the semiconductor particles. These combined changes first enhance photocatalytic activity by increasing light absorption at visible wavelengths. However, high concentrations of oxygen vacancies lower the photocatalytic activity both by introducing new relaxation pathways that promote char...Continue Reading

References

Nov 22, 2005·Journal of Biochemical and Biophysical Methods·Ana GomesJosé L F C Lima
Feb 17, 2009·Proceedings of the National Academy of Sciences of the United States of America·Marcus JonesGregory D Scholes
Apr 16, 2009·Nano Letters·Weilin XuPeng Chen
Dec 9, 2009·Journal of the American Chemical Society·Xiaochun ZhouPeng Chen
Aug 7, 2010·Journal of the American Chemical Society·Fan ZuoPingyun Feng
Sep 22, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Denis R M GodoiDaniel Scherson
Apr 19, 2011·Journal of the American Chemical Society·Takashi TachikawaTetsuro Majima
May 11, 2011·Chemical Communications : Chem Comm·Liqun YeJiujun Zhang
Nov 15, 2011·Physical Chemistry Chemical Physics : PCCP·Liqun YeLing Zan
Feb 22, 2012·Journal of the American Chemical Society·Weilin XuA Paul Alivisatos
Oct 15, 2013·Journal of the American Chemical Society·Kun ZhaoJun Jie Yin
Jul 8, 2015·Proceedings of the National Academy of Sciences of the United States of America·Yuwei ZhangA Paul Alivisatos
Dec 8, 2015·ACS Applied Materials & Interfaces·Haifeng FengShixue Dou
Jun 9, 2016·Chemistry of Materials : a Publication of the American Chemical Society·Alex M GanoseDavid O Scanlon
Jun 29, 2016·Journal of the American Chemical Society·Ning ZhangYujie Xiong
Sep 1, 2016·Journal of the American Chemical Society·Tao ChenWeilin Xu
Dec 20, 2016·The Journal of Physical Chemistry Letters·Kan Zhang, Jong Hyeok Park
Mar 18, 2017·Chemical Reviews·Tao ChenNing Fang
Aug 1, 2016·Chemical Science·Davinder S BhachuClaire J Carmalt
Jul 10, 2019·Nature Chemistry·Xianwen MaoPeng Chen

❮ Previous
Next ❯

Citations


❮ 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.