物理学报2024，Vol.73Issue(2)：76-83,8.DOI:10.7498/aps.73.20231265
原位合成方法制备超灵敏和高特异性的微型氢气传感器
Preparation of ultra-sensitive and highly specific miniature hydrogen sensors by in situ synthesis methods
摘要
Abstract
Hydrogen,as one of the most well-developed green energy materials,has played an important role in industrial development,human production and life,and the treatment of diseases in recent years.Hydrogen sensor is an important safety monitoring equipment in chemical production.Developing long-term and efficient hydrogen gas sensor for real-time monitoring has become increasingly important and urgent.Hydrogen,as one of the main combustible gases present in the petrochemical production process,is of great research significance and challenging in meeting the need of cycling gas identification and highly sensitive detection.Therefore,it is of great practical value to develop the low-cost,low-power and highly sensitive miniature hydrogen gas sensors.In this work,a gold-doped tin dioxide nanostructured ultra-sensitive and highly specific micro-nanosensor is obtained based on the in-situ synthesis of micro-hot plates.It is shown that the sensitivity of this nanosensor is as high as 100 for hydrogen at 50 ppm,and the sensitivity of ethanol,an important interference gas,is only 1/22 of that of hydrogen at the same concentration,which has an obvious suppression effect.For the same concentration of carbon monoxide,methane and other interference gases do not show any response.XPS characterization shows that the defective oxygen ratio of the material is the main reason for the ultra-sensitivity of the sensor.Meanwhile,in this study,the precursor solution of gold-doped tin dioxide is prepared by using chloroauric acid and tin tetrachloride crystals as raw materials;the nanosized morphology structure is prepared by templating the generation of sensitive materials using polystyrene microspheres;the in-situ synthesis method is realized by applying a voltage to the calcination of a micro hot plate.Through this nanoscale templating in-situ heating method,a gold-loaded tin dioxide nanosensor is prepared.Note that the template assisted in-situ grown Au loaded Tin Oxide nano sensor is abbreviated as TIS-Au-SnO2 Sensor.In order to illustrate the sensing mechanism,we analyze the elemental compositions,and the results show that under the condition of the high defective oxygen content,the in-situ heating method of templated preparation of Au-SnO2 nano-sensor containing arrays of polystyrene spheres becomes an important reason for the ultra-sensitivity to hydrogen,high specificity,and the suppression of the important interfering gas,ethanol.Moreover,the in situ preparation method can be flexibly and scalably used to prepare high-performance miniaturized gas sensors with a variety of hollow-sphere nanostructured metal oxides,in order to obtain excellent sensitivity and adjustable selectivity.关键词
原位生长/超灵敏/气体传感器Key words
in-situ growth/ultra sensitive/gas sensors引用本文复制引用
葛一璇,于婷婷,梁文杰..原位合成方法制备超灵敏和高特异性的微型氢气传感器[J].物理学报,2024,73(2):76-83,8.基金项目
中国石化创新计划(批准号:A-527)资助的课题. Project supported by the Sinopec Innovation Scheme,China(Grant No.A-527). （批准号:A-527）
