ZnSe/NiO heterostructure-based chemiresistive-type sensors for low-concentration NO2 detection

• 作者: Wei Liu Ding Gu Jian-Wei Zhang Xiao-Gan Li Marina N.Rumyantseva Alexander M.Gaskov
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ADVANCED NANOMATERIALS FOR GAS AND HUMIDITY SENSORS
• 页码范围: 1632-1641
• 页数: 10页
• 语种: 英文

摘要

Novel ZnSe/NiO heterostructure nanocompos-ites were successfully prepared by one-step hydrothermal method.The ZnSe/NiO-based sensor exhibits a response of ～ 96.47％ to 8 × 10-6 NO2 at 140 ℃,which is sig-nificantly higher than those of intrinsic ZnSe-based (no response) and NiO-based (～ 19.65％) sensors.The theo-retical detection limit (LOD) of the sensor is calculated to be 8.91 × 10-9,indicating that the sensor can be applied to detect the ultralow concentrations of NO2.The effect of NiO content on the gas-sensing performance of the nanocomposites was investigated in detail.The optimal NiO content in the nanocomposite is determined to be 15.16％ to achieve the highest response.The as-fabricated sensor also presents an excellent selectivity to several possible interferents such as methanol,ethanol,acetone,benzene,ammonia and formaldehyde.The enhanced sensing performance can be attributed to the formation of p-p heterostructures between ZnSe and NiO,which indu-ces the charge transfer across the interfaces and yields more active sites.