石墨烯—聚苯胺復(fù)合薄膜的制備及其氨敏特性研究
發(fā)布時(shí)間：2018-10-17 12:56
【摘要】：石墨烯材料具有極大的比表面積和優(yōu)良的電學(xué)性質(zhì),在電子學(xué)、傳感器、新能源材料和器件、光學(xué)、生物醫(yī)學(xué)等諸多領(lǐng)域顯示出巨大的應(yīng)用前景。本論文以石墨烯、負(fù)載氧化錫的石墨烯和苯胺為原料,制備了石墨烯-聚苯胺二元復(fù)合薄膜和負(fù)載氧化錫的石墨烯-聚苯胺三元復(fù)合氨敏膜,分別采用掃描電鏡(SEM)和紫外-可見(jiàn)光譜(UV-Vis)對(duì)薄膜微觀形貌和結(jié)構(gòu)進(jìn)行了表征;以平面微叉指電極為傳感器件結(jié)構(gòu)制備了復(fù)合薄膜氨氣傳感器,室溫條件下測(cè)試了其氣敏特性,研究了石墨烯摻雜量和制備工藝對(duì)傳感器氨敏性能的影響,并分析了復(fù)合薄膜傳感器氣敏機(jī)理。論文的主要內(nèi)容如下:1.運(yùn)用原位自組裝技術(shù)制備了石墨烯-聚苯胺復(fù)合薄膜(1-GR-PANI),研究了石墨烯摻雜量對(duì)復(fù)合薄膜氣敏性能的影響,對(duì)比分析了石墨烯/聚苯胺分層薄膜(1-GR/PANI)和復(fù)合薄膜的氨氣敏感性能。研究發(fā)現(xiàn)復(fù)合薄膜呈現(xiàn)為納米纖維網(wǎng)狀結(jié)構(gòu),比單一聚苯胺薄膜(PANI)生長(zhǎng)更均勻,薄膜孔隙更大,具有更大的比表面積,顯示出比單一PANI薄膜更優(yōu)的氣敏特性。當(dāng)苯胺單體量為0.002mol,石墨烯摻雜量為1mg時(shí),復(fù)合薄膜的敏感性能最佳。實(shí)驗(yàn)結(jié)果表明制備工藝對(duì)薄膜的氣敏性能有較大影響,復(fù)合薄膜傳感器的氣敏性能優(yōu)于分層薄膜,分析認(rèn)為可能是石墨烯不僅為苯胺單體聚合提供了基體,增大復(fù)合薄膜的比表面積,同時(shí)對(duì)聚苯胺有摻雜作用,在復(fù)合薄膜中形成π-π共軛結(jié)構(gòu),有利于載流子傳輸。2.運(yùn)用原位氧化聚合法制備了負(fù)載氧化錫的石墨烯-聚苯胺(30-GS-PANI)復(fù)合材料,采用旋涂制膜工藝制備了單一PANI、負(fù)載氧化錫的石墨烯薄膜(30-GS)和30-GS-PANI復(fù)合薄膜,并研究了其氨氣敏感特性。30-GS-PANI的表面形貌和紫外光譜分析表明,PANI和GS并不是簡(jiǎn)單的物理混合,而是在形成復(fù)合材料時(shí)發(fā)生了一定的化學(xué)相互作用,PANI圍繞GS納米片生長(zhǎng),形成均勻的納米纖維結(jié)構(gòu)。實(shí)驗(yàn)研究了GS摻雜量對(duì)30-GS-PANI性能的影響,當(dāng)GS摻雜量為30mg,苯胺為0.002mol時(shí),復(fù)合薄膜具有最佳的氣敏性能。實(shí)驗(yàn)同時(shí)采用物理混合法制備了混合薄膜,對(duì)比分析了混合薄膜與復(fù)合薄膜傳感器對(duì)NH3的響應(yīng)特性,結(jié)果表明復(fù)合薄膜較混合薄膜有更優(yōu)異的氣敏特性,這可能是由于三元半導(dǎo)體復(fù)合材料之間形成了π-π共軛體系以及界面之間產(chǎn)生了多重異質(zhì)結(jié)效應(yīng),有利于氣體分子吸附與響應(yīng)。
[Abstract]:Graphene materials have great specific surface area and excellent electrical properties, which show great application prospects in electronics, sensors, new energy materials and devices, optics, biomedicine and many other fields. In this paper, graphene, graphene supported graphene and aniline were used as raw materials to prepare graphene Polyaniline binary composite film and tin oxide supported graphene Polyaniline composite ammonia sensitive film. The microstructure and microstructure of the films were characterized by scanning electron microscopy (SEM) and UV-Vis spectroscopy (UV-Vis), and the composite thin film ammonia sensors were fabricated using planar micro-interDigital electrodes as the sensing devices, and their gas-sensing properties were measured at room temperature. The effect of graphene doping amount and preparation process on the ammonia sensing performance of the sensor was studied and the gas sensing mechanism of the composite film sensor was analyzed. The main contents of the thesis are as follows: 1. Graphene Polyaniline (1-GR-PANI) composite films were prepared by in situ self-assembly technique. The effect of graphene doping on the gas sensing properties of the composite films was studied. The ammonia sensing properties of graphene / Polyaniline layered films (1-GR/PANI) and composite films were compared and analyzed. It is found that the composite thin films have nano-fiber network structure, which are more uniform than the single Polyaniline thin film (PANI) growth, larger pore size and larger specific surface area, showing a better gas sensitivity than a single PANI film. When the amount of aniline monomer was 0.002 mol and the amount of graphene doped was 1mg, the sensitivity of the composite film was the best. The experimental results show that the preparation process has a great influence on the gas sensing performance of the film, and the gas sensing performance of the composite film sensor is better than that of the layered film. It is considered that graphene not only provides the substrate for the polymerization of aniline monomer, By increasing the specific surface area and doping Polyaniline, 蟺-蟺 conjugated structure is formed in the composite film, which is favorable for carrier transport. 2. Graphene-Polyaniline (30-GS-PANI) composites supported on tin oxide were prepared by in situ oxidation polymerization. Graphene films (30-GS) and 30-GS-PANI composite films supported on single PANI, tin oxide were prepared by spin coating process. The surface morphology and UV spectra of 30-GS-PANI show that PANI and GS are not a simple physical mixture, but a certain chemical interaction occurs in the formation of composite materials. PANI grows around GS nanoparticles. A uniform nanofiber structure is formed. The effect of doping amount of GS on the properties of 30-GS-PANI was investigated experimentally. When the doping amount of GS was 30 mg and aniline was 0.002mol, the composite film had the best gas sensing performance. At the same time, the mixed film was prepared by physical mixing method. The response characteristics of the hybrid film and the composite film sensor to NH3 were compared and analyzed. The results show that the composite film has better gas sensitivity than the mixed film. This may be due to the formation of 蟺-蟺 conjugated systems between ternary semiconductor composites and the effect of multiple heterojunctions between interfaces, which is beneficial to the adsorption and response of gas molecules.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB383.2
本文編號(hào)：2276726
[Abstract]:Graphene materials have great specific surface area and excellent electrical properties, which show great application prospects in electronics, sensors, new energy materials and devices, optics, biomedicine and many other fields. In this paper, graphene, graphene supported graphene and aniline were used as raw materials to prepare graphene Polyaniline binary composite film and tin oxide supported graphene Polyaniline composite ammonia sensitive film. The microstructure and microstructure of the films were characterized by scanning electron microscopy (SEM) and UV-Vis spectroscopy (UV-Vis), and the composite thin film ammonia sensors were fabricated using planar micro-interDigital electrodes as the sensing devices, and their gas-sensing properties were measured at room temperature. The effect of graphene doping amount and preparation process on the ammonia sensing performance of the sensor was studied and the gas sensing mechanism of the composite film sensor was analyzed. The main contents of the thesis are as follows: 1. Graphene Polyaniline (1-GR-PANI) composite films were prepared by in situ self-assembly technique. The effect of graphene doping on the gas sensing properties of the composite films was studied. The ammonia sensing properties of graphene / Polyaniline layered films (1-GR/PANI) and composite films were compared and analyzed. It is found that the composite thin films have nano-fiber network structure, which are more uniform than the single Polyaniline thin film (PANI) growth, larger pore size and larger specific surface area, showing a better gas sensitivity than a single PANI film. When the amount of aniline monomer was 0.002 mol and the amount of graphene doped was 1mg, the sensitivity of the composite film was the best. The experimental results show that the preparation process has a great influence on the gas sensing performance of the film, and the gas sensing performance of the composite film sensor is better than that of the layered film. It is considered that graphene not only provides the substrate for the polymerization of aniline monomer, By increasing the specific surface area and doping Polyaniline, 蟺-蟺 conjugated structure is formed in the composite film, which is favorable for carrier transport. 2. Graphene-Polyaniline (30-GS-PANI) composites supported on tin oxide were prepared by in situ oxidation polymerization. Graphene films (30-GS) and 30-GS-PANI composite films supported on single PANI, tin oxide were prepared by spin coating process. The surface morphology and UV spectra of 30-GS-PANI show that PANI and GS are not a simple physical mixture, but a certain chemical interaction occurs in the formation of composite materials. PANI grows around GS nanoparticles. A uniform nanofiber structure is formed. The effect of doping amount of GS on the properties of 30-GS-PANI was investigated experimentally. When the doping amount of GS was 30 mg and aniline was 0.002mol, the composite film had the best gas sensing performance. At the same time, the mixed film was prepared by physical mixing method. The response characteristics of the hybrid film and the composite film sensor to NH3 were compared and analyzed. The results show that the composite film has better gas sensitivity than the mixed film. This may be due to the formation of 蟺-蟺 conjugated systems between ternary semiconductor composites and the effect of multiple heterojunctions between interfaces, which is beneficial to the adsorption and response of gas molecules.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB383.2
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 樊瑋;張超;劉天西;;石墨烯/聚合物復(fù)合材料的研究進(jìn)展[J];復(fù)合材料學(xué)報(bào);2013年01期
，本文編號(hào)：2276726
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