Light-Induced Room-Temperature Gas Sensing by Donor-Doped Anatase TiO2 Ultrasmall Nanoparticles

被引：2

作者：

Eglitis, Raivis ^{[1
]}

Kiisk, Valter ^{[2
]}

Kodu, Margus ^{[2
]}

Vanags, Martins ^{[1
]}

Jaaniso, Raivo ^{[2
]}

Smits, Krisjanis ^{[3
]}

Sutka, Andris ^{[1
]}

机构：

[1] Riga Tech Univ, Inst Mat & Surface Engn, Fac Nat Sci & Technol, LV-1048 Riga, Latvia

[2] Univ Tartu, Inst Phys, Lab Sensor Technol, EE-50411 Tartu, Estonia

[3] Univ Latvia, Inst Solid State Phys, LV-1063 Riga, Latvia

来源：

ACS APPLIED ENGINEERING MATERIALS | 2024年 / 2卷 / 03期

关键词：

titanium dioxide; gas sensors; lightactivated; photodoping; transition metal doping; semiconductorgas sensors; THIN-FILM; UV-LIGHT; SENSORS; ETHANOL; FORMALDEHYDE; ACTIVATION; PHOTOLUMINESCENCE; MOLECULES;

D O I：

10.1021/acsaenm.3c00727

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Gas sensors that detect volatile organic compounds (VOCs) at room temperature are highly attractive for low-power devices and safety. One of the best alternatives to thermal activation is the UV-A light, which allows gas sensor room-temperature operation. Here, we demonstrate how the doping of TiO2 via transition metals (Nb5+, Ta5+ and Hf4+) can increase the gas sensing performance of UV-activated VOC gas sensors prepared from these particles. Doping increased the gas sensing response by more than an order of magnitude, while the response time decreased by as much as 38%, compared to the undoped TiO2 sample. The effect was attributed to additional electron accumulation facilitated by the introduced dopants.

引用

页码：649 / 658

页数：10

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