Abstract

The development of selective and cheap metal oxide gas sensor at ambient temperature is still a challenging idea. In this study, SnO2 surface functionalization was performed in order to obtain sensitive and selective gas sensor operated at ambient temperature. 3-aminopropyltriethoxysilane (APTES) was used as an intermediate step, followed by functionalization with molecules having acyl chloride with different end functional groups molecules such as alkyl, acid and ester groups. Acid and ester modified sensors are sensitive to ammonia between 0.2 and 10 ppm at room temperature. However, ester modified SnO2 is more selective than acid modified sensor regarding ethanol and carbon monoxide gases.

Highlights

  • A simple and noninvasive tool for disease diagnosis is offered by the detection of gases in exhaled breath

  • The conductance of pure SnO2 decreases upon exposure to ammonia gas

  • SnO2-APTES shows no change in conductance upon exposure to ammonia

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Summary

Introduction

A simple and noninvasive tool for disease diagnosis is offered by the detection of gases in exhaled breath. Metal oxide chemical sensors are promising devices because they are small, easy to use and less expensive than other spectrometry techniques [1] For such application, the gas sensor should be sensitive to low concentration of gas and selective to one gas in presence of other gases. Some work on silicon nanowire field effect transistors showed change in the working principle of the sensor In this case, the interactions are between the gas and the grafted organic layer rather than the metal oxide substrate. The interactions of gases with the attached layer lead to change in the dipole moment that variate the electrical properties of substrate (e.g., SnO2) [2] Such modified sensors work at ambient temperature which reduces the power consumption since these sensors will be used in portable devices

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