本論文分為二部分，第一部分探討石墨烯堆疊不同層數於氮化矽基板結構之氨氣感測器，並進行物性及電性之分析；第二部分探討二硫化銅銦量子點-石墨烯複合奈米結構之氨氣感測器，並進行物性及電性之分析。

本研究第一部分重點是使用不同層數石墨烯以及電漿後處理石墨烯之氨氣感測器，研究發現使用電漿後處理會使得石墨烯表面之比表面積增加，增強其氨氣感測特性，與石墨烯氨氣感測器(2.98%)相比，基於電漿後處理石墨烯氨氣感測器顯示出極高的氨氣響應特性(26.06%)。主要原因是透過電漿後處理之石墨烯誘導了更多的活性位以吸附更多的氧氣。

在第二部分中，首次使用二硫化銅銦量子點-石墨烯複合奈米結構，並研究其複合結構及其氨氣感測特性。透過複合石墨烯，本研究發現二硫化銅銦量子點的氨氣感測特性，並利用二硫化銅銦量子點的光特性使得基於二硫化銅銦量子點-石墨烯複合奈米結構氨氣感測器具有23.65%優異的氨氣感測特性，其高於二硫化銅銦量子點氨氣感測器(0.87%)以及石墨烯氨氣感測器(2.98%)。主要原因是二硫化銅銦量子點-石墨烯複合奈米結構具有優異的複合性能以及結構表面缺陷形成的氧空位，實現了高靈敏度的氨氣響應特性。

Highly sensitive within low threshold limit detection of ammonia (NH3) at room temperature is essential for appropriate environmental monitoring because NH3 is dangerous to the environment when it exceeds 25ppm limit in air. Since NH3 could be fuel replacement option and several uses in agriculture and industrial applications thus monitoring ammonia is extremely important to avoid any health hazards. For that reason, it is highly important to fabricate highly sensitive multifunctional NH3 sensors that can sense low ppm of NH3. It’s also important to sense the flammable NH3 in low operation temperature with stability for lower power consumption. In this context, graphene (Gr) based materials are highly promising multifunctional nanomaterial in several applications, especially have demonstrated noteworthy progress in gas sensing applications. Herein, we report highly enhanced NH3-gas-sensing properties of plasma post treated graphene materials and subsequently the graphene and CuInS2 were combined for the first time to achieve high NH3-gas sensitivity in room temperature.
First section of this study focus on the fabrication of NH3 gas sensors using different layer Gr with plasma post-treatment (Gr-plasma post-treatment). The systematic investigations were revealed that using plasma post-treatment to increase the specific surface area of Gr, strongly influence the gas sensing performance. The Gr with plasma post-treatment based gas sensor shows superb enhancement in ammonia sensitivity of 26.06% comparing to Gr gas sensor (2.98%). It is believed that the plasma post-treatment onto Gr induces more active sites for the adsorption of O2.
In the second section, for the first time, we develop novel nanostructure using CuInS2-Gr composite structures and studied their structural and gas sensing properties. For the first time the gas sensing behavior of CuInS2 is discovered with hybridization of Gr. Interestingly, CuInS2-Gr hybrid composites possess excellent gas sensing response of 23.65%, which is overwhelmingly higher than bare CuInS2 (0.87%), bare Gr and CuInS2-Gr (4.30%). The highly enhanced NH3 sensing properties achieved due to the excellent hybridization properties and formation of structural oxidized surface defects in CuInS2-Gr nanohybrids. These results indicate the noteworthy progress for the fabrication of new generation NH3 sensors.

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