TY - JOUR
T1 - Rational design of Bi-doped rGO/Co3O4 nanohybrids for ethanol sensing
AU - Cai, Sheng-Xun
AU - Song, Xian-Qiang
AU - Chi, Zong-Tao
AU - Fu, Richard
AU - Fang, Zheng-Tao
AU - Geng, Sun-Ying-Yue
AU - Kang, Ya-Ru
AU - Yang, Xiao-Xu
AU - Qin, Jian-Feng
AU - Xie, Wan-Feng
N1 - Funding information: This work was financially supported by the National Natural Science Foundation of China (Grant No. 51227804). This work was also funded by the Postdoctoral Scientific Research Foundation of Qingdao, National College Students Innovation and Entrepreneurship Training Program of China (No. G201911065028), College Students Innovation and Entrepreneurship Training Program of Qingdao University (X201911065058). The authors would like to thank the Chemical Experimental Teaching Center of Qingdao University for the characterizations, and Kehui Han from Shiyanjia Lab (www.shiyanjia.com) for the XPS and UPS analysis.
PY - 2021/9/15
Y1 - 2021/9/15
N2 - Gas sensors based on metal oxide semiconductors (MOSCs) and reduced graphene oxide (rGO) for sensing of organic volatile compounds often suffer from high operation temperature, low responses, poor selectivity, or narrow detection range. Herein, we design and fabricate Bi-doped rGO/Co3O4 (BGCO) nanohybrids with a flower morphology, which have been applied as a sensing layer for an ethanol sensor. This BGCO sensor exhibits a maximum p-type response of 178.1 towards 500 ppm ethanol at an optimum working temperature of 120 °C. The sensor’s detection range for the ethanol concentration is from 500 ppb to 500 ppm, and the sensor has an excellent selectivity to ethanol compared to other types of organic volatile gases and oxidizing gas such as NO2. The enhanced ethanol sensing mechanism is attributed to the increased conductivity of Bi doped rGO/Co3O4 material. Additionally, incorporation of Bi dopant can promote the redox reaction, and the rGO/Co3O4 act as the catalyst.
AB - Gas sensors based on metal oxide semiconductors (MOSCs) and reduced graphene oxide (rGO) for sensing of organic volatile compounds often suffer from high operation temperature, low responses, poor selectivity, or narrow detection range. Herein, we design and fabricate Bi-doped rGO/Co3O4 (BGCO) nanohybrids with a flower morphology, which have been applied as a sensing layer for an ethanol sensor. This BGCO sensor exhibits a maximum p-type response of 178.1 towards 500 ppm ethanol at an optimum working temperature of 120 °C. The sensor’s detection range for the ethanol concentration is from 500 ppb to 500 ppm, and the sensor has an excellent selectivity to ethanol compared to other types of organic volatile gases and oxidizing gas such as NO2. The enhanced ethanol sensing mechanism is attributed to the increased conductivity of Bi doped rGO/Co3O4 material. Additionally, incorporation of Bi dopant can promote the redox reaction, and the rGO/Co3O4 act as the catalyst.
KW - Bi doped Co O
KW - Ethanol sensor
KW - Resistive sensor
KW - Semiconducting metal oxide
KW - rGO
UR - http://www.scopus.com/inward/record.url?scp=85106563650&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2021.130118
DO - 10.1016/j.snb.2021.130118
M3 - Article
SN - 0925-4005
VL - 343
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
M1 - 130118
ER -