發(fā)布時(shí)間：2018-01-17 12:49

  本文關(guān)鍵詞：鎢氧化物納米材料的制備、改性及氣敏性能研究　出處：《大連海事大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： WO_3 W_(18)O_(49) 石墨烯 氣敏性能

【摘要】：鎢氧化物(WOx)是一種多功能金屬氧化物半導(dǎo)體材料,以良好的氣敏性能被制成傳感器并廣泛地應(yīng)用于各個(gè)領(lǐng)域。WO3、W18O49為常見的鎢氧化物,它們獨(dú)特的晶體結(jié)構(gòu)使其具有氣敏檢測(cè)的潛力。制備WO3納米管、WO3納米片及W18O49納米纖維三種不同結(jié)構(gòu)的鎢氧化物納米材料,研究其氣敏性能。石墨烯能加速電子在材料表面的遷移能力增強(qiáng)材料活性,將石墨烯摻雜入鎢氧化物納米材料改性,改善材料氣敏性能。1.采用溶劑熱法合成WO3納米管,材料比表面積達(dá)34.61m2/g。將石墨烯摻雜到WO3中制備復(fù)合材料,制成的器件和純WO3器件的最佳工作溫度均340℃,氣敏器件的靈敏度隨氣體濃度增加而增大且沒有飽和趨勢(shì)。摻雜了石墨烯的氣敏器件敏性能優(yōu)于純WO3,對(duì)不同氣體進(jìn)行測(cè)試,發(fā)現(xiàn)器件對(duì)乙醇?xì)怏w的選擇性突出,靈敏度達(dá)13.1。2.EDTA銨鹽輔助合成WO3納米片,氣敏測(cè)試結(jié)果顯示氣敏器件對(duì)乙醇的響應(yīng)-恢復(fù)時(shí)間非常短,但靈敏度和選擇性有待提高。添加石墨烯對(duì)WO3材料改性,氣敏器件在工作溫度300℃下表現(xiàn)突出的氣敏性能,對(duì)100mg/L乙醇?xì)怏w的靈敏度為14.8,是純WO3材料2倍多,具檢測(cè)乙醇?xì)怏w的潛能。3.采用水熱法合成W18O49納米纖維,純W18O49材料最佳工作溫度為370℃,摻雜石墨烯改性后不僅僅使器件工作溫度減小到340℃,且對(duì)100mg/L乙醇?xì)怏w表現(xiàn)出較好的靈敏度,較純W18O49材料高出2倍多,對(duì)乙醇、甲醇?xì)鈽泳哂休^好的選擇性。摻雜石墨烯改性能有效地改善W18O49氣敏器件工作溫度高、靈敏度低的缺點(diǎn)。
[Abstract]:Tungsten oxide (WX) is a kind of multifunctional metal oxide semiconductor material, which has been made into sensors with good gas sensitivity and has been widely used in various fields. W18O49 is a common tungsten oxide, and its unique crystal structure makes it have the potential of gas sensitive detection. WO3 nanotubes are prepared. Three kinds of tungsten oxide nanomaterials with different structures, WO3 and W18O49 nanofibers, were studied. Graphene can accelerate the mobility of electrons on the surface of the materials and enhance the activity of the materials. WO3 nanotubes were synthesized by solvothermal method by modifying graphene with tungsten oxide nanomaterials to improve the gas sensitivity of the materials. The specific surface area is 34.61m2 / g. Graphene is doped into WO3 to prepare composites. The optimum working temperature of the fabricated devices and pure WO3 devices is 340 鈩，

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