發(fā)布時間：2018-05-08 08:52

  本文選題：氧化鎢 + 納米花�。� 參考：《五邑大學》2017年碩士論文

【摘要】：金屬氧化物納米材料因其表現(xiàn)出新穎的物理特性,在光電學、傳感器、光催化等領(lǐng)域受到研究者廣泛的關(guān)注。近年來,過渡金屬氧化物納米材料——氧化鎢納米材料也成為了科技和工程領(lǐng)域的一個研究焦點,主要是由于它具有特別的納米形貌和能帶結(jié)構(gòu),在光電子器件、電化學等領(lǐng)域具有巨大的潛在應(yīng)用價值。本論文的研究工作主要集中在于探索氧化鎢三維復合納米結(jié)構(gòu)材料的制備和應(yīng)用,首先嘗試制備出不同的氧化鎢納米材料,然后把這類材料應(yīng)用于氣敏傳感器領(lǐng)域和光催化降解染料,最后通過材料表征、性能測試、機理分析與討論。本論文所取得的主要研究結(jié)論,可概述如下:1.發(fā)展了一種用于制備金屬及其氧化物核殼結(jié)構(gòu)的種子種植法,并定域生長了一種W-W_(18)O_(49)納米花結(jié)構(gòu)體。通過SEM、XRD、TEM進行表征,同時通過記錄材料的生長過程,建立了氧化鎢納米花的生長機理模型,為在納米空間進行人為的精確定向排列和組裝,以及構(gòu)造新型的三維復合納米材料打下了基礎(chǔ)。2.利用WO_3納米花結(jié)構(gòu)體的高比表面積以及Pt表面修飾,制備了基于納米花結(jié)構(gòu)體薄膜的氣體傳感器,在室溫下對傳感器的氣敏特性和反應(yīng)機理進行系統(tǒng)的研究。研究表明,Pt表面修飾WO_3納米花結(jié)構(gòu)體薄膜在室溫下具有較高靈敏度,該薄膜的氫氣濃度檢測量程為50 ppm~5000 ppm,其電阻變化率與氫氣濃度成線性關(guān)系,其檢測范圍已達到標準的工業(yè)氫氣檢測范圍,能夠有效地降低了氫氣傳感器的工作溫度。氣敏傳感機理與表面勢壘調(diào)控和結(jié)構(gòu)水模型有關(guān)。3.通過高溫無氧退火,在碳纖維布上構(gòu)建了具有氧缺陷的W_(18)O_(49)光催化材料,發(fā)現(xiàn)該材料在可見光或無光環(huán)境下均可降解甲基橙染料分子,并通過其催化性能進行測試和分析,試圖探索氧缺陷W_(18)O_(49)光催化材料的催化反應(yīng)降解甲基橙機理。該研究結(jié)果的意義在于擴展氧化鎢光催化材料的光譜響應(yīng)范圍至可見光區(qū),也有助于在暗環(huán)境中降解污水的有毒染料分子。
[Abstract]:Metal oxide nanomaterials have attracted extensive attention in the fields of optoelectronics, sensors, photocatalysis and so on for their novel physical properties. In recent years, transition metal oxide nanomaterials, tungsten oxide nanomaterials, have also become a research focus in the fields of science, technology and engineering, mainly because they have special nano-morphology and band structure in optoelectronic devices. Electrochemistry and other fields have great potential application value. In this paper, the main research work is to explore the preparation and application of tungsten oxide three-dimensional composite nanostructured materials. First, we try to prepare different tungsten oxide nanomaterials. Then this kind of material is applied to the field of gas sensor and photocatalytic degradation of dyes. Finally, the material characterization, performance test, mechanism analysis and discussion are carried out. The main conclusions of this paper can be summarized as follows: 1. A seed planting method for the preparation of metal and its oxide core-shell structure was developed, and a W-W _ S _ (18) O _ (T _ (49)) nano-flower structure was grown locally. The growth mechanism model of tungsten oxide nanowires was established by means of SEM XRDX TEM and the growth process of the materials were recorded. And the construction of new three dimensional composite nanomaterials lay the foundation. 2. 2. Based on the high specific surface area and Pt surface modification of WO_3 nano-flower structure, a gas sensor based on nano-flower structure film was prepared. The gas sensing characteristics and reaction mechanism of the sensor were systematically studied at room temperature. The results show that the surface modification of WO_3 nanostructured WO_3 thin films has a high sensitivity at room temperature. The hydrogen concentration detection range of the films is 50 ppm~5000 ppm.The change rate of resistance is linearly related to the hydrogen concentration. Its detection range has reached the standard industrial hydrogen detection range, which can effectively reduce the working temperature of hydrogen sensor. Gas sensing mechanism is related to surface barrier regulation and structural water model. A novel photocatalytic material with oxygen defect, WSCL _ (18) O / O _ (49), was constructed on carbon fiber cloth by high temperature anoxic annealing. It was found that the material could degrade methyl orange dye molecule in visible light or light free environment, and its catalytic properties were tested and analyzed. This paper attempts to explore the mechanism of catalytic degradation of methyl orange by photocatalytic materials. The significance of this study lies in extending the spectral response range of tungsten oxide photocatalytic materials to the visible region, and also contributing to the degradation of toxic dyestuff molecules in dark environment.
【學位授予單位】：五邑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ136.13;TB383.1

【參考文獻】

相關(guān)期刊論文 前1條

1 龔力;劉笑;謝方艷;張衛(wèi)紅;陳建;;氬離子轟擊還原三氧化鎢納米線薄膜的光電子能譜研究[J];分析測試學報;2009年01期

相關(guān)碩士學位論文 前1條

1 張周s，

本文編號：1860753