Metastable Antimony‐Doped SnO2 Quantum Wires for Ultrasensitive Gas Sensors. (28th December 2021)

• Record Type: Journal Article
• Authors: Song, Zhilong; Hu, Zhixiang; Liu, Jingyao; Yan, Jia; Li, Huaming; Jiang, Jianjun; Tang, Jiang; Liu, Huan
• Is Part Of: Advanced Electronic Materials. Volume 8:Number 5(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-28
• Subjects: gas sensor -- metastable antimony‐doping -- oxygen vacancy -- quantum wire -- tin oxide; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.202101049
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: Doping is fundamental to controlling the properties of bulk semiconductors. Although the antimony (Sb V )‐doping strategy is widely employed in the design of practical tin oxide (SnO2 ) semiconductor gas sensors for higher signal‐to‐noise ratio, challenges remain to dope semiconductor nanocrystals since the diffusion of impurity atoms may be far from realized at the synthesis temperatures used. Herein, a metastable Sb‐doping strategy is proposed to overcome the serious receptor‐versus‐transducer mismatch in SnO2 quantum wires (QWs). The solvothermal synthesis of colloidal Sb III ‐doped SnO2 QWs has been conducted at 180 °C, whereby the antimony amount is varied to optimize the structural and morphological properties for higher surface activity and electrical conductivity. A unique n‐type doping mechanism arising from the stable presence of Sb III on SnO2 (101) facets via Sn II ‐O‐Sb III is demonstrated. Further, the use of sensitive (down to 4 ppb, the lowest detection limit ever reported), fast (response and recovery time of 43 s and 96 s toward 10 ppm of H2 S) gas sensors for H2 S detection at near room temperature (40 °C) is showcased. The metastable Sb‐doping strategy may pave the way to ultrasensitive gas sensor possessing low power consumption and excellent integration compatibility to satisfy the increasing demand for ubiquitous and reliable gas detection. Abstract : N‐type doping of nanocrystalline SnO2 with metastable antimony (Sb Ⅲ ) is achieved. Sb Ⅲ doping is capable of tailoring the surface activity and electrical conductivity of SnO2 quantum wire, successfully realizing receptor and transducer function optimization in promoting the gas‐sensing performance and achieving a fast, sensitive and reversible gas sensor for ppb‐level H2 S detection at near room temperature.