Using ATTO Dyes To Probe the Photocatalytic Activity of Au−CdS Nanoparticles
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
The Department of Chemistry seeks to provide students with a foundation in the fundamentals and application of chemical theories and processes of the lab. Thus prepared they me pursue careers as teachers, industry supervisors, or research chemists in a variety of domains (governmental, academic, etc).
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The Department of Chemistry was founded in 1880.
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1880-present
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- College of Liberal Arts and Sciences (parent college)
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Abstract
Metal−semiconductor nanohybrids (or heterostructures), such as Au−CdS, have become an important class of materials because of their role in photochemical hydrogen production and in other catalytic reactions. Here we report the results of photophysical studies of the interactions of these particles with ATTO dyes (ATTO 590 and 655), which are used as fluorescent probes in a wide range of spectroscopic techniques, most notably super-resolution microscopies. The most important feature of the Au−CdS particles is that they provide the possibility of selective excitation at either their CdS or their Au domains, which absorb preferentially at wavelengths shorter or longer than 500 nm, respectively, thus making possible an excited-state charge transfer reaction from ATTO. Fluorescence quenching of ATTO is dominated by charge transfer to either the CdS domain (λex = 400 nm) or the Au domain (λex = 570 nm). This quenching is quantified by steady-state and time-resolved absorption and fluorescence measurements, and its assignment is confirmed by electrochemical measurements. The results indicate that the ATTO dyes are sensitive and useful probes for measuring the photocatalytic activity of nanoparticles. Characterizing the nonradiative processes of the ATTO dyes in the presence of these catalytically active particles provides a means of gauging their utility in the wide range of spectroscopies in which they are employed.
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Reprinted with permission from Journal of Physical Chemistry C (2016): doi:10.1021/acs.jpcc.6b09814. Copyright 2016 American Chemical Society.