Related Experiment Video
Updated: Jan 27, 2026

Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets
Published on: August 18, 2023
Structural-Controlled Synthesis of Highly Efficient Visible Light TiO2 Photocatalyst via One-Step Single-Mode
Kunihiko Kato1, Yunzi Xin1, Takashi Shirai2
1Advanced Ceramics Research Center, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan.
Abstract:
TiO2 with different chemical structures are successfully synthesized via a one-step single-mode magnetic microwave (SMMW) assisted process, during where Ti selectively oxidizes in magnetic field under Ar-O2 mixed atmosphere. The chemical state and band structure of the as-prepared TiO2 are well-controlled by changing the volume fraction of O2 (φO2) during SMMW synthesis. Ti3+ self-doped TiO2 (TiO2-x, 0 < x < 2) is synthesized under lower φO2, while TiO2 with specific core/shell structure (TiO2+y core/TiO2-x-TiO2+z shell) is observed under higher φO2. The as-synthesized TiO2 with controlled structures show sufficient light absorption in visible region and quite narrow bandgap (2.05 eV∼), whose value can be also tuned by φO2 during SMMW synthesis. In addition, the synthesized TiO2 exhibits highly efficient photocatalytic performance towards the degradation of Rhodamine B under UV and visible light irradiation. The formation mechanism for different structural TiO2 can be attributed to the specific rapid heating and cooling dynamics induced by SMMW irradiation.
More Related Videos
12:07Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
Published on: April 1, 2013
06:49Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
Published on: April 22, 2016
Related Concept Videos
Synthesis and Decomposition Reactions
Multi-Step Reactions
The Wave Nature of Light
What is a Mode?
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
Rate-Determining Steps
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
Light Acquisition