Engineering defects and photocatalytic activity of TiO2 nanoparticles by thermal treatments in NH3 and subsequent surface chemical etchings

Literature Information

Publication Date 2017-08-11
DOI 10.1039/C7CP03579A
Impact Factor 3.676
Authors

Xiaomei Yu, Yunfei Wang, Yu Kwon Kim


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Abstract

TiO2 nanoparticles with N dopants were prepared by thermal treatments in NH3 and their surface defects were controlled by post chemical etching in HF to find out the influence of the N dopants on photoactivity. The effect of N-doping is found to enhance the photoactivity of TiO2, but is strongly dependent on the degree of N-doping and the detailed distribution of nitrogen species within the TiO2 nanoparticles. In particular, the N-rich layers formed near the surface are found to contribute to the enhanced photoactivity due to the reduced band gap. But, the increase in the N concentration may induce defects that act as recombination centers and reduce the photoactivity. Subsequent chemical etching in HF confirms the existence of the substitutional N species near the surface from the observation of paramagnetic N species. But, prolonged HF treatments are found to decrease the photoactivity primarily due to the removal of the N-rich surface layers that are responsible for the enhanced photoactivity. Our results show that the photoactivity of N-doped TiO2 is strongly influenced by the type and the density of the N dopants induced by the N doping.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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