Site-selectively grown SnO2 NWs networks on micromembranes for efficient ammonia sensing in humid conditions

SENSORS AND ACTUATORS B-CHEMICAL

卷:232

Article

Sama, Jordi^1,2  Barth, Sven³  Domenech-Gil, Guillem^1,2  Prades, Joan-Daniel^1,2  Lopez, Nuria⁴  Casals, Olga^1,2  Gracia, Isabel⁵  Cane, Carles⁵  Romano-Rodriguez, Albert^1,2 

[1] Univ Barcelona, MIND Dept Elect, C Marti i Franques 1, E-08028 Barcelona, Spain

[2] Univ Barcelona, Inst Nanosci & Nanotechnol IN2UB, C Marti i Franques 1, E-08028 Barcelona, Spain

[3] Vienna Univ Technol TUW, Inst Materials Chem, Getreidmarkt 9-BC-02, A-1060 Vienna, Austria

[4] Inst Chem Res Catalonia ICIQ, Av Paisos Catalans 16, E-43307 Tarragona, Spain

[5] CSIC, IMB CNM, Campus UAB, E-08193 Bellaterra, Spain

关键词: SnO2 nanowires network;    Ammonia gas sensor;    Localized growth;    Low power consumption;   

DOI  :  10.1016/j.snb.2016.03.091

来源: Elsevier

【 摘 要 】

SnO2 NWs networks on heated micromembranes have been characterized as ammonia sensors. The approach allows achieving reproducible growth and stable and long-lasting ammonia sensors with site specific grown SnO2 NWs. The devices have been tested both in dry and humid conditions showing response time down to two minutes. Sensors have been tested up to 1 month, only presenting variation of the base resistance with full retention of the response towards the gaseous analytes. Different concurrent sensing mechanisms have been identified relating the determined sensing kinetics with previous theoretical calculations. Specifically, oxygen dissociation seems to play a key role in the overall ammonia sensing sequence. In humid conditions, moisture reduces the response to ammonia but also lowers the activation energy of the reaction process. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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