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Electrons moving inside gold: Optical microscope experiment strategy

Date:
August 12, 2022
Source:
DGIST (Daegu Gyeongbuk Institute of Science and Technology)
Summary:
Engineers have developed an experimental strategy to control and observe the chemical reaction of a single nanocatalyst using an optical microscope -- Expected to contribute to catalyst design based on accurate understanding of the photocatalytic reaction through an analysis method that helps understanding the electron excitation phenomenon and transition path.
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A research team led by Professor Seo Dae-ha of the Department of Physics and Chemistry at DGIST (President Kuk Yang) developed an optical microscopy that can control and observe electron transfer and transfer in complex chemical reactions occurring in nano-catalysts. This technology is expected to provide an experiment strategy based on system chemistry, a new experiment strategy for precisely studying photocatalysts at the single particle level.

Plasmonic metals at the nanometer level, such as gold, exhibit high light absorption rate in a wide place within the range of visible light. They are combined with semiconductor photocatalysts to act as a medium to increase light absorption. Excitation occurs in which electrons gain energy and move as a reaction to light absorption, and it appears through various paths depending on the size of the metal and the wavelength of the light. There are various hypotheses on the effect of this electron movement as a catalyst. The research team was able to test the hypotheses and reveal how electrons transfer by developing a new microscope that is experimentally simpler and more sophisticated than the conventional method of observing chemical reactions.

Professor Seo Dae-ha's research team developed hybrid nanoparticles (for example, 'gold/copper oxides', a combination of gold and copper oxides), and lasers of different wavelengths (colors) (i.e., lasers A, B, and C are A+B, A+C ... A+B+C) were combined into a new form, respectively, to investigate the reaction between them to test various hypotheses on the electron excitation phenomenon through experiments and verify them one by one. Through this process, the team was able to selectively induce electron excitation in gold nanoparticles, and quantitatively analyze their contributions by evaluating the increase in the reactivity of the catalyst. In addition, the team confirmed that these excited electrons were transferred to the semiconductor to increase stability and reactivity at the same time.

"The observational technology reported here is a technology that observes chemical reactions with high precision, efficiency, and low cost," said Professor Seo Dae-ha of the Department of Physics and Chemistry at DGIST, while adding, "It is expected that it will contribute to the sophisticated design of catalysts and will be applied as a sophisticated evaluation and control technology using nanoparticles for pharmaceuticals."

Meanwhile, this research was carried out with support of the National Research Foundation's Leading Researcher Support Project, Leading Research Center, Biomedical Technology Development Project, and DGIST's Grand Challenge Research Innovation Project.


Story Source:

Materials provided by DGIST (Daegu Gyeongbuk Institute of Science and Technology). Note: Content may be edited for style and length.


Journal Reference:

  1. Yongdeok Ahn, Jiseong Park, Minsoo Park, Siwoo Jin, Woohyun Jo, Jeongho Kim, Seung Hwan Cho, Daeha Seo. Combinatorial selective synthesis and excitation experiments for quantitative analysis of effects of Au on a semiconductor photocatalyst. Chem, 2022; DOI: 10.1016/j.chempr.2022.06.004

Cite This Page:

DGIST (Daegu Gyeongbuk Institute of Science and Technology). "Electrons moving inside gold: Optical microscope experiment strategy." ScienceDaily. ScienceDaily, 12 August 2022. <www.sciencedaily.com/releases/2022/08/220812113456.htm>.
DGIST (Daegu Gyeongbuk Institute of Science and Technology). (2022, August 12). Electrons moving inside gold: Optical microscope experiment strategy. ScienceDaily. Retrieved April 20, 2024 from www.sciencedaily.com/releases/2022/08/220812113456.htm
DGIST (Daegu Gyeongbuk Institute of Science and Technology). "Electrons moving inside gold: Optical microscope experiment strategy." ScienceDaily. www.sciencedaily.com/releases/2022/08/220812113456.htm (accessed April 20, 2024).

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