A Microorganism Bred TiO<sub>2</sub>/Au/TiO<sub>2</sub> Heterostructure for Whispering Gallery Mode Resonance Assisted Plasmonic Photocatalysis

Choudhary

et al. 2021

Small

254

143

Section: Tio 2 -Based Materials For Plasmonic Photocatalysismentioning

confidence: 99%

Recent Advances in Plasmonic Photocatalysis Based on TiO₂ and Noble Metal Nanoparticles for Energy Conversion, Environmental Remediation, and Organic Synthesis

Choudhary

et al. 2021

Small

254

143

Advanced Energy Materials

“…Therefore, the photocatalytic activity depends on the number of available electrons and holes on the surface of particulate catalysts for reactions. [29][30][31] Generally speaking, the lightabsorption capability of photocatalyst is a prerequisite to achieve efficient charge carrier (electrons and holes) generation for subsequent reactions. Hence, improving the optical absorption of TiO 2 is an effective route to enhance its photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Zhang

et al. 2020

141

currents, geothermal, biomass, and solar, have been developed as alternatives. Among them, solar energy is the most abundant, inexpensive, nonpolluting, and sustainable. [5][6][7][8] Some semiconductors, so called photocatalysts, which possess the capacity to harvest solar energy to drive catalytic reactions for valuable chemical production, have been designed and fabricated to achieve efficient solar energy utilization. [9][10][11][12][13][14][15][16][17][18][19] Typically, TiO 2 is recognized as one of the most promising candidates due to its chemical stability, nontoxicity, and high resistance to photocorrosion. [20][21][22][23][24][25] In general, TiO 2 possesses three major phases, including anatase, rutile and brookite, and many other minor phases, such as monoclinic TiO 2 (B). All of them have wide bandgaps of 3.0-3.2 eV. Hence, TiO 2 can only absorb ultraviolet light (UV), while the visible light accounting for ≈43% of solar energy cannot be utilized. Furthermore, the rapid recombination of photogenerated electrons and holes severely limits its quantum efficiency. Thus, overall photocatalytic activity of TiO 2 is very limited, especially under visiblelight irradiation. [26][27][28] A complete photocatalytic reaction using TiO 2 -based photocatalysts involves three major steps: i) light absorption and The photocatalytic properties of TiO 2 have aroused a broad range of research interest since 1972 due to its abundance, chemical stability, and easily available nature. To increase its overall activity, in the past few decades, much effort has been devoted to the fabrication of advanced TiO 2 -based photocatalysts with visible-light response and these photocatalysts have shown great potential in the field of solar energy utilization. Here, recent progress in the investigation of visible-light responsive TiO 2 -based materials are reviewed. Notably, the fabrication strategies and corresponding chemical/ physical properties of visible-light responsive TiO 2 -based materials are described in detail, with a focus on bandgap engineering and junction engineering from the perspective of light absorption, charge transfer and separation, and surface reactions. Their applications in solar-fuel production, organic synthesis, bacterial disinfection, pollutant degradation and nitrogen fixation are also discussed. Moreover, the new trends and ongoing challenges in this field are proposed and highlighted.

“…[31,33] By contrast, in the Au NPs/TiO 2 /CFM electrode (right part), the photoelectrochemistry was essentially changed to the plasmonic type, [31,34] in which the light-induced collective oscillations of conduction electrons could generate the surface plasmon resonance of Au NPs with the characteristic absorption peak %530 nm. [35] In this case, the used 425 nm light source could not effectively induce the charge separation and transfer, leading to lower photon-to-electron conversion efficiency and thus decreased photocurrent.…”

Section: Gate Photoanode Developmentmentioning

confidence: 99%

Regulating Light‐Sensitive Gate of Organic Photoelectrochemical Transistor toward Sensitive Biodetection at Zero Gate Bias

Lü

Chen

et al. 2021

Small Structures

Although great advances have been achieved in the field of organic electrochemical transistor (OECT) biodetection, its fundamental sensing principles are still highly limited. Different from current dominating protocols for OECT biodetection, herein, the bio‐dependent regulation of light‐sensitive gate electrode for transducing the corresponding biological events is introduced. Exemplified by the enzymatically catalytic growth of gold nanoclusters to gold nanoparticles on the 3D TiO2/carbon fiber matrix gate electrode, the photoelectrochemistry of the hybrid gate photoanode shifts from the type‐II heterojunction to plasmonic type, rendering reduced photon‐to‐electron efficiency and thus decreased current response of the gate photoanode. By connecting to an alkaline phosphatase‐associated sandwich immunoassay event toward the representative analyte of C‐reactive protein, the model system exhibits target‐dependent tunability and good analytical performance at zero gate bias. A new sensing principle for OECT biodetection is manifested, and would spur more creativity to explore the rich light–matter interplay for advanced OECT biodetection.