本文選題：復合材料 + rGO-MOx��； 參考：《鄭州大學》2017年碩士論文

【摘要】：隨著社會及工業(yè)生產(chǎn)的高速發(fā)展,產(chǎn)生的有毒、有害氣體的種類及數(shù)量不斷增加,氣體傳感器就是伴隨著環(huán)境污染的日益嚴重而發(fā)展起來的。金屬氧化物半導體氣敏傳感器具有生產(chǎn)成本低、體積小巧、氣敏材料易制備等優(yōu)點被廣泛應用于氣體檢測,然而選擇性差、工作溫度高等缺點限制了其進一步發(fā)展。石墨烯因具有大比表面積、快的電子傳輸速度而被廣泛用于傳感器研究中。本課題主要研究將微量還原氧化石墨烯(rGO)與金屬氧化物半導體材料如SnO_2、TiO_2復合提高氧化物半導體材料的氣敏性能,采用靜電紡絲技術制備氧化物半導體納米纖維,并通過二步水熱法在氧化物納米纖維表面修飾rGO,以及在氧化物納米纖維紡絲制備過程中,直接加入氧化石墨烯(GO),通過后續(xù)煅燒合成rGO/氧化物半導體復合納米纖維氣敏材料,系統(tǒng)研究rGO的加入及加入方式對rGO-氧化物半導體復合納米纖維氣敏性能的影響,具體研究內(nèi)容如下:1.通過靜電紡絲法制備TiO_2納米纖維,通過在靜電紡絲前驅(qū)液中加入rGO,調(diào)節(jié)靜電紡絲參數(shù)制備出rGO/TiO_2復合納米纖維,探討了rGO的復合對于TiO_2納米纖維形貌結(jié)構以及VOCs氣敏性能的影響。結(jié)果顯示,rGO的復合對于材料的形貌及晶體結(jié)構未產(chǎn)生巨大影響,并且提高了材料對VOCs的靈敏度。在250℃下,rGO/TiO_2復合材料對于200ppm乙醇氣體的靈敏度達到43.24,是TiO_2靈敏度的22.8倍,其響應時間也較TiO_2納米纖維有所減少。2.通過靜電紡絲法制備純TiO_2納米纖維,然后通過二步水熱法利用rGO對TiO_2納米纖維進行表面修飾,制備出rGO表面修飾TiO_2納米纖維。表征結(jié)果顯示rGO使TiO_2表面形貌更加粗糙,但未影響TiO_2材料的晶體結(jié)構。氣敏結(jié)果表明,rGO表面修飾的TiO_2納米纖維進一步提升了材料的靈敏度,縮短了響應恢復時間。3.利用靜電紡絲法制備rGO/SnO_2復合納米纖維,二步水熱法制備rGO表面修飾SnO_2納米纖維,研究rGO對于其他n型金屬氧化物半導體VOCs氣敏性能的影響。氣敏測試結(jié)果表明,rGO的復合以及表面修飾對于SnO_2納米纖維靈敏度提升更加明顯,在150℃下,rGO表面修飾SnO_2納米纖維對100ppm乙醇的靈敏度高達287,并且與SnO_2納米纖維相比,其響應與恢復時間均相對縮短。
[Abstract]:With the rapid development of social and industrial production, the types and quantities of toxic and harmful gases are increasing, and gas sensors are developing with the increasingly serious environmental pollution. The metal oxide semiconductor gas sensor has many advantages, such as low production cost, small volume and easy preparation of gas sensitive materials. The further development of gas detection, however, is limited by poor selectivity and high working temperature. Graphene has been widely used in sensor research for its large specific surface area and rapid electronic transmission speed. This topic is mainly to improve the micro reduction of graphene oxide (rGO) and gold oxide semiconductor materials such as SnO_2 and TiO_2. The gas sensing properties of oxide semiconductor materials are prepared by electrostatic spinning technology. The oxide semiconductor nanofibers are prepared by two step hydrothermal method, and rGO is modified on the surface of oxide nanofibers, and GO is directly added to the preparation of oxide nanofibers. The rGO/ oxide semiconductor is synthesized by subsequent calcination. The effect of addition and addition of rGO on the gas sensitive properties of rGO- oxide semiconductor composite nanofibers is systematically studied with nano fiber gas sensitive materials. The specific contents are as follows: 1. the TiO_2 nanofibers are prepared by electrostatic spinning, and the rGO/TiO_2 composite nanofibers are prepared by adding rGO in electrostatic spinning precursor and adjusting the parameters of electrostatic spinning. The effect of rGO composite on the morphology and VOCs gas sensing properties of TiO_2 nanofibers was investigated. The results showed that the composite of rGO had no great influence on the morphology and crystal structure of the material, and increased the sensitivity of the material to VOCs. At 250, the sensitivity of rGO/TiO_2 compound to 200ppm ethanol gas reached 4. 3.24, 22.8 times the sensitivity of TiO_2, and its response time is less than that of TiO_2 nanofibers..2. nanofibers are prepared by electrospinning. Then the surface modification of TiO_2 nanofibers by the two step hydrothermal method is used to prepare the rGO surface modified TiO_2 nanofiber. The result shows that rGO makes the surface of TiO_2 more surface morphologies. The crystal structure of TiO_2 materials is not affected, but the gas sensitivity results show that the TiO_2 nanofibers modified by rGO surface can further enhance the sensitivity of the materials and shorten the response time,.3. using the electrostatic spinning method to prepare rGO/SnO_2 composite nanofibers, and the two step hydrothermal method to prepare the rGO surface to modify the SnO_2 nanofibers, and to study rGO for other n. The gas sensitive performance of type metal oxide semiconductor VOCs. The gas sensitivity test results show that the sensitivity of rGO composite and surface modification is more obvious for SnO_2 nanofibers. At 150, the sensitivity of rGO surface modified SnO_2 nanofibers to 100ppm ethanol is higher than that of SnO_2 nanofibers, and the response and recovery time of the SnO_2 nanofibers are compared with the SnO_2 nanofibers. All of them are relatively short.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB33;TB383.1

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