本文選題：氧化鋅 + 銀納米顆粒�。� 參考：《南京理工大學(xué)》2016年碩士論文

【摘要】：氣敏傳感器在環(huán)境保護(hù)、食品安全、公共交通以及化工生產(chǎn)等領(lǐng)域都有著重要的應(yīng)用。傳統(tǒng)氣敏材料存在工作溫度高、靈敏度低、選擇性差等缺點(diǎn),通過貴金屬表面修飾已成為研究的熱點(diǎn)。與此同時(shí),石墨烯或化學(xué)還原的氧化石墨烯(rGO)作為一種新穎的二維碳材料,有望應(yīng)用到氣敏元件中,進(jìn)一步改善氣敏元件的性能。本文首先采用簡單的室溫沉積法制備ZnO-Ag復(fù)合物。該方法實(shí)現(xiàn)了將Ag顆粒成功負(fù)載在ZnO的表面。當(dāng)Ag顆粒的負(fù)載量為1 wt%時(shí),敏感元件對1000ppm乙醇的靈敏度達(dá)到884.7,是純ZnO的12.6倍,具有非常優(yōu)異的氣敏響應(yīng)。不僅如此,元件對乙醇?xì)怏w有很好的選擇性及優(yōu)良的穩(wěn)定性,有望在未來應(yīng)用于乙醇傳感器中。進(jìn)一步地,利用一步溶劑熱法制備ZnO/rGO二元復(fù)合物,再通過室溫沉積法制備ZnO-Ag/rGO三元復(fù)合物。通過透射電子顯微鏡、掃描電子顯微鏡、X-射線衍射、X-射線光電子能譜、拉曼光譜、紅外光譜等手段對所得的產(chǎn)物進(jìn)行表征,并研究其氣敏性能。經(jīng)過實(shí)驗(yàn)條件對比分析,溶劑和表面活性劑的種類、氧化石墨烯和銀的加入對體系的形貌及氣敏性能均有影響。石墨烯片層以及Ag的引入有助于:nO-Ag/rGO三元復(fù)合物形貌與性能的優(yōu)化。與ZnO、SnO2等相比,在低工作溫度范圍,α-MoO3展現(xiàn)出優(yōu)異的氣敏性能。利用一步溶劑熱法制備MoO3/rGO二元復(fù)合物,再在500℃下煅燒2h得到最終產(chǎn)物。結(jié)果表明該納米帶狀產(chǎn)物是正交相α-MoO3,對乙醇表現(xiàn)出較好的響應(yīng)特性。在工作溫度為260℃時(shí),可以檢測到10 ppm乙醇?xì)怏w。在100 ppm乙醇?xì)怏w氛圍中,與純MoO3相比,其靈敏度提高了1個(gè)數(shù)量級。
[Abstract]:Gas sensors have important applications in environmental protection, food safety, public transportation and chemical production. Traditional gas sensing materials have the disadvantages of high working temperature, low sensitivity, poor selectivity and so on. At the same time, graphene or chemically reduced graphene oxide (RGO), as a novel two-dimensional carbon material, is expected to be applied to gas sensors and further improve the performance of gas sensors. In this paper, ZnO-Ag composites were prepared by a simple room temperature deposition method. In this method, Ag particles were successfully loaded on the surface of ZnO. When the loading amount of Ag particles is 1 wt%, the sensitivity of the sensitive element to 1000ppm ethanol is 884.7, which is 12.6 times as high as that of pure ZnO. Moreover, the element has good selectivity and good stability for ethanol gas, which is expected to be used in ethanol sensors in the future. Furthermore, ZnO/rGO binary composites were prepared by one step solvothermal method, and ZnO-Ag/rGO ternary complexes were prepared by room temperature deposition. The products were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (Raman) and infrared spectroscopy (IR), and their gas sensing properties were studied. By comparing and analyzing the experimental conditions, it was found that the types of solvents and surfactants, the addition of graphene oxide and silver had an effect on the morphology and gas sensitivity of the system. The introduction of graphene and Ag can help to optimize the morphology and properties of the ternary composites. Compared with ZnO _ (2) O _ (2), 偽 -MoO _ (3) exhibits excellent gas sensitivity in the range of low operating temperature. MoO3/rGO binary composites were prepared by one step solvothermal method and calcined at 500 鈩，

本文編號：1884697