A review on metal-oxide based p-n and n-n heterostructured nano-materials for gas sensing applications

Sensors International

Athira John¹  Sowmya B²  P.K. Panda² 

[1]Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India

[2]Materials Science Division, CSIR – National Aerospace Laboratories, Old Airport Road, Kodihalli, Bengaluru, 560017, India

关键词: Gas sensors;    Nanostructures;    Sensor parameters;    Sensing material and sensing mechanism;   

DOI  :  

来源: DOAJ

【 摘 要 】

Gas sensor is a device that converts the information of an analyte species into electrical signals using various detection principles. Electrical conductivity is one of the crucial properties of sensing materials. This basic property is modified with the formation of p-n and n-n heterostructures or by the inclusion of dopants. Surface morphology of a sensing material plays a vital role in the adsorption of analyte species for effective gas sensing behavior, further this can be improved with proper surface treatment viz., surface reactions by decorating with nanoparticles composed of various noble metals. The sensing mechanism differs owing to various morphologies with sensing materials. Sensing materials can either be polymers, metal oxides, nanoparticles or pertinent combination of these constituents. The sensor properties like selectivity, sensitivity, stability, response time and detection limits are influenced by morphology, material exposed to target gas and operating conditions. This review focusses on sensing mechanism and monitoring of nanostructures (nanorods, nanosheets, nanobelts, nanoribbons, nanowires, nanoflowers, spinel etc.) by appropriate combination of materials and dopants. The performance of numerous metal oxide-based gas sensing devices and their market trends are reviewed.

【 授权许可】

Unknown