Details

Autor(en) / Beteiligte

• Li, Siqi
• Diao, Yingjie
• Yang, Zijie
• He, Junming
• Wang, Jing
• Liu, Chaochao
• Liu, Fangmeng
• Lu, Huiying
• Yan, Xu
• Sun, Peng
• Lu, Geyu

Titel

Enhanced room temperature gas sensor based on Au-loaded mesoporous In2O3 nanospheres@polyaniline core-shell nanohybrid assembled on flexible PET substrate for NH3 detection

Ist Teil von

• Sensors and actuators. B, Chemical, 2018-12, Vol.276, p.526-533

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The room temperature NH3 sensor based on Au-Mesoporous In2O3 Nanospheres@ PANI hybrid assembled on flexible PET substrate was developed.•The sensor utilizing PAIn20A1 showed the highest response of 46 to 100 ppm NH3 at room temperature.•The fabricated sensor exhibited liner NH3 sensing properties, acceptable response and recovery times and excellent selectivity towards NH3.•The improved sensing performance was attributed to the synergistic effect of p-n junction of PANI and In2O3 and catalytic effect of Au. The polyaniline (PANI) and Au-loaded mesoporous In2O3 nanospheres@PANI core-shell nanohybrid (PAInxAy) sensing materials with different amounts of mesoporous In2O3 and Au-loaded mesoporous In2O3 (2–50 mol%) nanospheres were synthesized through combination methods of facile hydrothermal and in-situ chemical oxidative polymerization. The loading amount of Au was varied from 0.5 at% to 2.0 at%. The sensing materials were performed on flexible polyethylene terephthalate (PET) substrate to fabricate the sensing device and investigate the gas sensing performances at room temperature. Various characterization techniques including FESEM, TEM, FTIR, XRD and XPS were performed to identify the morphology, structure and element information of the synthesized materials. The sensing performances demonstrated that the sensor utilizing 1 at% Au-loaded 20 mol% mesoporous In2O3 nanospheres@PANI core-shell nanohybrid (PAIn20A1) showed the highest response value (∼46) to 100 ppm NH3 at room temperature, which were about 14 times and 4 times higher than those of pure PANI and PAIn10. The sensor also exhibited excellent selectivity, good reproducibility and perfect response-concentration linearity to NH3 at room temperature. Besides, the effect of relative humidity on the sensing performance and the sensing mechanism for the sensitivity enhancement were discussed.