NH3 sensing with self-assembled ZnO-nanowire μHP sensors in isothermal and temperature-pulsed mode

SENSORS AND ACTUATORS B-CHEMICAL

卷:226

Article

Shao, F.^1,2  Fan, J. D.^1,3  Hernandez-Ramirez, F.^1,4  Fabrega, C.¹  Andreu, T.¹  Cabot, A.¹  Prades, J. D.⁴  Lopez, N.⁵  Udrea, F.^6,7  De Luca, A.⁶  Ali, S. Z.⁷  Morante, J. R.^1,4 

[1] Catalonia Inst Energy Res IREC, E-08930 St Adria Del Besos, Spain

[2] Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China

[3] Univ Oxford, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England

[4] Univ Barcelona, Dept Elect, E-08028 Barcelona, Spain

[5] Inst Chem Res Catalonia ICIQ, Tarragona 43007, Spain

[6] Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England

[7] Cambridge CMOS Sensors Ltd, Cambridge, England

关键词: ZnO;    Nanowire;    Micro hot plate;    Ammonia;    Gas sensor;    Temperature-pulsed;   

DOI  :  10.1016/j.snb.2015.11.109

来源: Elsevier

【 摘 要 】

Dielectrophoretic alignment is found to be a simple and efficient method to deposit the solution prepared ZnO nanowires onto micro hot plate substrates. Due to the strong surface effects, positive temperature coefficient for resistance was encountered with ZnO nanowires in the high temperature range (>250 degrees C). The response to ammonia (NH3) was evaluated in isothermal and temperature-pulsed operation mode; the relative higher response observed in the latter case demonstrates that the use of this methodology is a good strategy to improve the performance of metal oxide sensors based on nanomaterials. Here, we evaluate the response to NH3 and qualitatively describe the sensing mechanism in temperature-pulsed mode, highlighting the main differences compared to the standard isothermal methodology. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free