本文選題：二氧化鈦 + 石墨烯�。� 參考：《廣東工業(yè)大學(xué)》2017年碩士論文

【摘要】：作為一種半導(dǎo)體,二氧化鈦(TiO_2)因其獨(dú)特的性能已成為現(xiàn)代材料系列中最引人矚目的材料,受到了眾多物理化學(xué)家、材料科學(xué)家和工程師的關(guān)注。本論文用石墨烯(GR)、聚苯胺(PANI)及聚吡咯(PPy)對(duì)TiO_2進(jìn)行改性,分別制備了GR-TiO_2納米復(fù)合物、PANI-GR-TiO_2納米復(fù)合物以及PPy-Ti O_2納米復(fù)合物,并對(duì)它們的光催化性能和光電性能進(jìn)行了研究。主要工作如下:(1)以FTO導(dǎo)電玻璃為基底,采用水熱法和旋涂法制備出GR修飾的TiO_2納米棒膜狀復(fù)合物。通過(guò)場(chǎng)發(fā)射掃面電子顯微鏡表征了所制備樣品的形貌,用X射線衍射儀和拉曼光譜儀分析了樣品的結(jié)構(gòu),結(jié)果表明,在棒狀金紅石型TiO_2的表面負(fù)載了一層透明的GR薄膜;利用紫外可見(jiàn)分光光度計(jì)研究了樣品的光學(xué)性質(zhì),結(jié)果表明,GR的加入拓寬了TiO_2的光吸收范圍;同時(shí),還探索了所制備的樣品分別在紫外光和模擬太陽(yáng)光照射下的光催化性能,結(jié)果表明,GR的加入增強(qiáng)了TiO_2的光催化性能;另外,還組裝了FTO-GR-TiO_2-FTO器件對(duì)GR-TiO_2納米復(fù)合物的UV光電性能進(jìn)行了測(cè)試,從而進(jìn)一步說(shuō)明GR的引入不僅增強(qiáng)了TiO_2對(duì)光的吸收,更為傳輸TiO_2的光生電子提供途徑,抑制了光生電子-空穴對(duì)的重組,增強(qiáng)了TiO_2的光催化性能。(2)利用原位化學(xué)沉積法在GR修飾的TiO_2納米棒膜狀復(fù)合物表面沉積PANI納米線薄膜,并組裝了FTO-PANI-GR-TiO_2-FTO器件。通過(guò)場(chǎng)發(fā)射掃描電子顯微鏡、拉曼光譜儀、紫外可見(jiàn)分光光度計(jì)以及熒光光譜儀對(duì)樣品的形貌、結(jié)構(gòu)、光學(xué)性質(zhì)進(jìn)行了表征,結(jié)果表明,PANI成功負(fù)載在GR-TiO_2納米復(fù)合結(jié)構(gòu)表面,且PANI的加入增強(qiáng)了TiO_2對(duì)光的吸收;通過(guò)電化學(xué)工作站對(duì)復(fù)合物的光電性能進(jìn)行了研究,發(fā)現(xiàn)PANI的加入增強(qiáng)了TiO_2對(duì)UV的響應(yīng),進(jìn)一步提高了TiO_2的光電性能,PANI-GR-Ti O_2納米復(fù)合物在紫外探測(cè)及傳感領(lǐng)域有一定的應(yīng)用價(jià)值。(3)利用原位化學(xué)沉積法在所制備的金紅石型TiO_2納米棒上負(fù)載了一層PPy納米線薄膜,控制沉積次數(shù),制備了PPy厚度不同的PPy-TiO_2納米復(fù)合物,并組裝了FTO-PPy-TiO_2-FTO器件。通過(guò)場(chǎng)發(fā)射掃描電子顯微鏡和拉曼光譜儀分析證實(shí)了金紅石型TiO_2納米棒頂端成功被PPy納米線薄膜覆蓋;通過(guò)紫外可見(jiàn)吸收光譜和光致發(fā)光光譜研究了復(fù)合物的光學(xué)性質(zhì),證明PPy的加入確實(shí)能夠增強(qiáng)純TiO_2對(duì)紫外光的吸收,且當(dāng)沉積次數(shù)為3次時(shí)增強(qiáng)效果最佳;通過(guò)電流時(shí)間曲線和交流阻抗曲線研究了復(fù)合物的光電性能,結(jié)果表明PPy的引入增強(qiáng)了器件對(duì)紫外光的響應(yīng),且沉積次數(shù)為3次時(shí)光電響應(yīng)效果最好。
[Abstract]:As a semiconductor, Titanium dioxide (TiO-2) has become the most attractive material in modern material series because of its unique properties. It has attracted the attention of many physical chemists, material scientists and engineers. In this paper, TiO_2 was modified by graphene, Polyaniline (pani) and polypyrrole (PPyR). The GR-TiO_2 nanocomposites, PANI-GR-TiO2 nanocomposites and PPy-Ti O _ 2 nanocomposites were prepared, and their photocatalytic and photoelectric properties were studied. The main work is as follows: (1) GR-modified TiO_2 nanorods were prepared by hydrothermal method and spin-coating method on FTO conductive glass substrate. The morphology of the samples was characterized by field emission scanning electron microscope. The structure of the samples was analyzed by X-ray diffraction and Raman spectroscopy. The results showed that a transparent gr film was deposited on the surface of rod-like rutile TiO_2. The optical properties of the samples were studied by UV-Vis spectrophotometer. The results show that the addition of gr broadens the optical absorption range of TiO_2, and also explores the photocatalytic properties of the prepared samples under ultraviolet and simulated sunlight, respectively. The results show that the addition of gr enhances the photocatalytic properties of TiO_2, and the UV photovoltaic properties of GR-TiO_2 nanocomposites are tested by assembled FTO-GR-TiO_2-FTO devices, which further shows that the introduction of gr not only enhances the absorption of light by TiO_2, but also enhances the photocatalytic properties of TiO_2. The photoelectron transport of TiO_2 provides a way to inhibit the recombination of photogenerated electron-hole pairs and enhance the photocatalytic performance of TiO_2. (2) PANI nanowire films were deposited on gr modified TiO_2 nanorods by in situ chemical deposition. The FTO-PANI-GR-TiO_2-FTO device is assembled. The morphology, structure and optical properties of the samples were characterized by field emission scanning electron microscope, Raman spectrometer, UV-Vis spectrophotometer and fluorescence spectrometer. The results showed that pani was successfully loaded on the surface of GR-TiO_2 nanocomposite structure. The addition of PANI enhanced the optical absorption of TiO_2, and the photoelectric properties of the composite were studied by electrochemical workstation. It was found that the addition of PANI enhanced the response of TiO_2 to UV. The photoelectrical properties of TiO_2 were further improved. PANI-GR-TiO _ 2 nanocomposites have certain application value in the field of UV detection and sensing. A layer of PPy nanowire films were deposited on rutile TiO_2 nanorods by in-situ chemical deposition. PPy-TiO_2 nanocomposites with different PPy thickness were prepared by controlling the deposition times, and FTO-PPy-TiO_2-FTO devices were assembled. The results of field emission scanning electron microscopy and Raman spectrometer show that the top of rutile TiO_2 nanorods is successfully covered by PPy nanowire films, and the optical properties of the composites are studied by UV-Vis absorption spectra and photoluminescence spectra. It is proved that the addition of PPy can enhance the absorption of ultraviolet light by pure TiO_2, and the best enhancement effect is obtained when the deposition times are 3 times, and the optoelectronic properties of the composite are studied by means of current time curve and AC impedance curve. The results show that the introduction of PPy enhances the response of the device to ultraviolet light, and the photoelectric response is the best when the deposition times are 3 times.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ134.11;TB383.1

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相關(guān)期刊論文 前1條

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本文編號(hào)：1779817