Title :
Quantitatively extracted Gibbs free-energy (ΔG) as criterion to determine working temperature range of gas sensing-material
Author :
Pengcheng Xu ; Haitao Yu ; Xinxin Li
Author_Institution :
State Key Lab. of Transducer Technol., Shanghai Inst. of Microsyst. & Inf. Technol., Shanghai, China
Abstract :
Micro-gravimetric resonant microcantilever is firstly used as a tool to determine the working temperature-range of molecule-adsorbing type sensing material. According to the criterion of ΔG(T)=ΔH-TΔS≥0, the maximum working-temperature (Tmax) for molecule-adsorbing function of the material can be obtained. This method is successfully used to determine the Tmax for two organophosphorus sensitive materials of mesoporous-silica and nano-spheric Stöber silica. The obtained results with the extracting method are verified by adsorbing/sensing experiment.
Keywords :
cantilevers; density measurement; free energy; gas sensors; micromechanical resonators; microsensors; nanosensors; temperature measurement; temperature sensors; weighing; Gibbs free-energy; adsorbing-sensing experiment; gas sensing-material; mesoporous-silica; microgravimetric resonant microcantilever; molecule-adsorbing type sensing material; nanospheric Stöber silica; organophosphorus sensitive material; Chemicals; Mathematical model; Mesoporous materials; Silicon compounds; Temperature measurement; Temperature sensors; Allowable maximum working-temperature; Gibbs free-energy; Organophosphorus sensitive materials; Resonant microcantilever; Working temperature-range;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS), 2015 Transducers - 2015 18th International Conference on
Conference_Location :
Anchorage, AK
DOI :
10.1109/TRANSDUCERS.2015.7181002
