【摘要】：氣體傳感材料及器件對工業(yè)安全、生產(chǎn)監(jiān)控、家用安全及醫(yī)療、軍事等領(lǐng)域均有重要的應用價值�，F(xiàn)有氣體傳感材料及器件在某些情況下不能滿足人們的需求,技術(shù)的進步和新材料的出現(xiàn)為人們提供了新的選擇和可能性。開發(fā)出能夠室溫檢測、壽命長久的氣體傳感材料及器件有著重要的意義。本論文基于氣體傳感固有機理及當今的科研熱點,在開發(fā)柔性透明氣體傳感膜及自修復型氣體傳感膜等方面進行了研究及探索。具體工作內(nèi)容和取得的成果如下：1.基于銀納米線網(wǎng)絡狀模板原位聚合生長聚苯胺,以過硫酸銨做氧化劑,通過控制刻蝕-聚合生長的平衡,獲得了透明網(wǎng)絡狀聚苯胺多級結(jié)構(gòu),由于銀納米線對PET表面性質(zhì)的影響,模板法制備的聚苯胺與非模板法制備的聚苯胺的納米形貌有著很大區(qū)別,采用模板法得到的聚苯胺是網(wǎng)絡狀多級結(jié)構(gòu),而非模板法得到的是顆粒狀結(jié)構(gòu),這兩種聚苯胺膜在氣體傳感方面也有著很大的差別,網(wǎng)絡狀多級結(jié)構(gòu)聚苯胺比非模板法制備的聚苯胺有更高的氣體傳感靈敏度和更好的選擇性,對50 ppm氨氣的傳感靈敏度為顆粒狀結(jié)構(gòu)聚苯胺的11.5倍,并且網(wǎng)絡狀多級結(jié)構(gòu)聚苯胺透明膜對氨氣的檢測限可低至5 ppm。網(wǎng)絡狀多級結(jié)構(gòu)聚苯胺膜采用銀膠粘附法即可制備氣體傳感器件,簡化了器件制備過程,比陶瓷管制備的聚苯胺氣敏元件性能更好,并且在100個平-彎循環(huán)后電阻基本保持不變。該工作對可穿戴設備及透明電子器件的研發(fā)有一定指導意義。2.在層層組裝的聚電解質(zhì)膜上構(gòu)筑多壁碳納米管網(wǎng)絡結(jié)構(gòu),聚電解質(zhì)通過靜電作用一層一層堆積,考察了不同循環(huán)組裝膜的光學性質(zhì)與柔性性能的區(qū)別。在構(gòu)筑碳納米管網(wǎng)絡狀結(jié)構(gòu)時選用了滴管滴涂、噴霧瓶噴涂與線棒涂膜,研究了不同涂膜方法的均勻性與透光性。其中,采用線棒涂膜法能夠獲得較好的均勻性與透光性,以2.5 mg/mL碳管分散液涂布的碳納米管覆蓋的聚電解質(zhì)膜550 nm的透光率可達74%,繼而,對聚電解質(zhì)膜及多壁碳納米管覆蓋的聚電解質(zhì)膜的自修復性能進行了考察,并對多壁碳納米管覆蓋聚電解質(zhì)膜的氣體傳感性能進行了研究。本工作對自修復電子器件的開發(fā)打下了一定基礎(chǔ)。
[Abstract]:Gas sensing materials and devices have important application value in industrial safety, production monitoring, household safety, medical treatment, military and other fields. The existing gas sensing materials and devices can not meet the needs of people under certain circumstances. The development of technology and the emergence of new materials provide people with new options and possibilities. It is of great significance to develop gas sensing materials and devices that can detect at room temperature and have long life. Based on the inherent mechanism of gas sensing and the current scientific research focus, this paper studies and explores the development of flexible transparent gas sensing film and self-repairing gas sensing film. The specific work and the results achieved are as follows: 1. Polyaniline was synthesized by in-situ polymerization of Polyaniline using silver nanowire network template and ammonium persulfate as oxidant. By controlling the equilibrium of etch-polymerization growth, the multilevel structure of transparent network Polyaniline was obtained. Because of the influence of silver nanowires on the surface properties of PET, the morphology of Polyaniline prepared by template method is very different from that prepared by non-template method. But the non-template method is granular, and the two Polyaniline films are also very different in gas sensing. The network polyaniline has higher sensitivity and better selectivity than the non-template Polyaniline, and the sensitivity to 50 ppm ammonia is 11.5 times that of granular Polyaniline. And the detection limit of ammonia gas on the polyaniline transparent membrane with network structure can be as low as 5 ppm.. The multilevel polyaniline film with network structure can be used to fabricate gas sensing devices by the method of silver glue adhesion, which simplifies the fabrication process of the devices and is better than the performance of the Polyaniline gas sensors prepared by ceramic tubes. And after 100 flat-bending cycles, the resistance remains basically the same. This work has certain guiding significance to the research and development of wearable devices and transparent electronic devices. 2. The structure of multi-walled carbon nanotubes (MCNTs) was constructed on layers of polyelectrolyte films. The difference between optical properties and flexible properties of different cyclic monolayers was investigated by electrostatic stacking of polyelectrolytes. The dripping tube, spray and wire rod coating were used to construct the carbon nanotube network structure. The uniformity and transmittance of different coating methods were studied. Among them, good uniformity and light transmittance can be obtained by wire-rod coating method. The transmittance of the polyelectrolyte film coated with 2.5 mg/mL carbon nanotube dispersion solution can reach 74 nm. The self-repairing properties of polyelectrolyte films and polyelectrolyte films covered by multi-walled carbon nanotubes were investigated and the gas sensing properties of polyelectrolyte films covered by multi-walled carbon nanotubes were studied. This work has laid a foundation for the development of self-repairing electronic devices.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB33;O659

【共引文獻】

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本文編號：2326032