【摘要】：當(dāng)今社會(huì)對于環(huán)境以及健康的關(guān)注已越來越高,因此,開發(fā)一種高靈敏度、優(yōu)選擇性、可用于多相(氣相或液相)的氣敏元件用來檢測環(huán)境污染氣體和有毒氣體就顯得十分必要。在眾多氣敏元件材料中,一些新型的金屬氧化物組合(尤其是p型聯(lián)合n型金屬氧化物半導(dǎo)體)已成為研究的熱點(diǎn)。與此同時(shí),石墨烯或化學(xué)還原的氧化石墨烯(rGO)作為一種新穎的碳材料,有望應(yīng)用到氣敏元件中,進(jìn)一步改善氣敏元件的性能。本文首先采用了兩步法(回流+水熱)制備了四氧化三鈷-氧化鋅-石墨烯三元復(fù)合物。在實(shí)驗(yàn)過程中,氨水的加入與蒸發(fā)對成功將p型半導(dǎo)體四氧化三鈷與n型半導(dǎo)體氧化鋅同時(shí)負(fù)載到石墨烯上面起到了關(guān)鍵作用。經(jīng)過實(shí)驗(yàn)條件對比分析,石墨烯片層以及PVP的引入有助于四氧化三鈷-氧化鋅/石墨烯三元復(fù)合物結(jié)構(gòu)與形貌的優(yōu)化。根據(jù)四氧化三鈷-氧化鋅/石墨烯傳感器元件的性能測試發(fā)現(xiàn),該材料可實(shí)現(xiàn)多相界面中的氣敏響應(yīng)。四氧化三鈷-氧化鋅/石墨烯對于氣相苯甲醛表現(xiàn)出優(yōu)秀的氣敏性能(對10 ppm苯甲醛達(dá)到靈敏度達(dá)到6.6)；同時(shí),四氧化三鈷-氧化鋅/石墨烯對于液相中的苯甲醛同樣呈現(xiàn)出良好的響應(yīng)(靈敏度達(dá)到7.98μA·cm-2·mM-1)。實(shí)驗(yàn)結(jié)果反映出四氧化三鈷-氧化鋅/石墨烯材料是一種適用于多相界面中檢測目標(biāo)物的新型材料。進(jìn)一步地,利用一步水熱法成功制備了氧化銅-氧化鋅/石墨烯三元復(fù)合物。通過對材料組分、形貌以及結(jié)構(gòu)的分析發(fā)現(xiàn),該方法實(shí)現(xiàn)了將大量納米尺度的p-n結(jié)(CuO-ZnO)引入到了rGO片層上。經(jīng)過氣敏測試發(fā)現(xiàn),該材料對丙酮表現(xiàn)出優(yōu)秀的響應(yīng)性能(對10 ppm苯甲醛靈敏度達(dá)到9.4)。更重要的是,該三元復(fù)合物氣敏元件實(shí)現(xiàn)了將具有交叉響應(yīng)現(xiàn)象的乙醇和丙酮?dú)怏w成功區(qū)分。該材料體系優(yōu)異的氣敏特性源于大量納米尺度的氧化銅-氧化鋅p-n結(jié)與石墨烯優(yōu)秀載體之間的協(xié)同作用。
[Abstract]:Today's society is paying more and more attention to the environment and health, so developing a kind of high sensitivity, selectivity, Gas sensors which can be used in multiphase (gas phase or liquid phase) are very necessary to detect environmental pollution gases and toxic gases. Among many gas sensor materials, some new metal oxide combinations (especially p-type combined n-type metal oxide semiconductors) have become the focus of research. At the same time graphene or chemically reduced graphene oxide (rGO) as a novel carbon material is expected to be used in gas sensors to further improve the performance of gas sensors. Firstly, the ternary complex of cobalt trioxide-zinc oxide-graphene was prepared by two-step (reflux hydrothermal) method. During the experiment, the addition and evaporation of ammonia played a key role in successfully loading p-type semiconductor cobalt trioxide and n-type semiconductor zinc oxide onto graphene at the same time. Through the comparative analysis of experimental conditions, the introduction of graphene lamellar layer and PVP is helpful to optimize the structure and morphology of Co _ 2O _ 4-ZnO / graphene ternary composites. According to the performance test of cobalt trioxide-zinc oxide / graphene sensor element, it is found that the material can realize the gas sensing response in the multiphase interface. Cobalt trioxide-zinc oxide / graphene exhibited excellent gas sensitivity to gas phase benzaldehyde (sensitivity to 10 ppm benzaldehyde was up to 6.6%). At the same time, cobalt trioxide-zinc oxide / graphene also showed a good response to benzaldehyde in liquid phase (sensitivity up to 7.98 渭 A cm- 2 mM-1). The experimental results show that cobalt trioxide-zinc oxide / graphene material is a new material suitable for the detection of target in multiphase interface. Furthermore, copper oxide-zinc oxide / graphene ternary composites were successfully prepared by one-step hydrothermal method. Through the analysis of the composition, morphology and structure of the material, it is found that a large number of nano-scale CuO-ZnO are introduced into the rGO lamellae by this method. After gas sensing test, it was found that the material showed excellent response to acetone (sensitivity to 10 ppm benzaldehyde reached 9.4). More importantly, the ternary complex gas sensor successfully distinguishes ethanol and acetone gases with cross-response. The excellent gas sensing properties of the material system are due to the synergistic action between a large number of nano-scale Cu _ 2O _ 3-ZnO p _ 2O _ n junctions and graphene excellent carriers.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN304

【引證文獻(xiàn)】

相關(guān)會(huì)議論文 前1條

1 焦正;;二氧化錫氣敏傳感器的研究進(jìn)展[A];第6屆輻射研究與輻射工藝學(xué)術(shù)年會(huì)論文集[C];2004年

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本文編號：2471903