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Uniform deposition of ultra-thin TiO_(2) film on mica substrate by atmospheric pressure chemical vapor deposition: Effect of precursor concentration

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Chinese Journal of Chemical Engineering 2023年第8期60卷 99-107页

作者： Ming Liu Ying Li Rui Wang Guoqiang Shao Pengpeng Lv Jun Li Qingshan Zhu State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical&Environmental Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The performance of pearlescent pigment significantly affected by the grain size and the roughness of deposited film. The effect of TiCl_(4) concentration on the initial deposition of TiO_(2) on mica by atmospheric pressure chemical vapor deposition(APCVD) was investigated. The precursor concentration significantly affected the deposition and morphology of TiO_(2) grains assembling the film. The deposition time for fully covering the surface of mica decreased from 120 to 10 s as the TiCl_(4) concentration increased from 0.38%to 2.44%. The grain size increased with the TiCl_(4) concentration. The AFM and TEM analysis demonstrated that the aggregation of TiO_(2) clusters at the initial stage finally result to the agglomeration of fine TiO_(2) grains at high TiCl_(4) concentrations. Following the results, it was suggested that the nucleation density and size was easy to be adjusted when the TiCl_(4) concentration is below 0.90%.

关键词： Chemical vapor deposition TiO_(2)thin film Nucleation reaction precursor concentration Pearlescent pigment

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Controlled growth of transition metal dichalcogenide via ther-mogravimetric prediction of precursors vapor concentration

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Nano Research 2021年第8期14卷 2867-2874页

作者： Long Fang Shaohua Tao Zhenzhen Tian Kunwu Liu Xi Li Jiang Zhou Han Huang Jun He Xiaoming Yuan Hunan Key Laboratory of Super Micro-structure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China School of Physics and Electronic Sciences Changsha University of Science and TechnologyChangsha 410004China School of Materials Science and Engineering Central South University Changsha 410083China

Transition metal dichalcogenide(TMD)alloys and heterostructures are attracting increasing attention thanks to their unique electronic,optical,and interfacial ***,the growth fundamental of TMD alloys and heterostructures during one-step growth is still beyond ***,thermogravimetric(TG/DTG)technology is introduced to predict the evolution of the precursor(MoO_(3)and WO_(3))concentration in the vapor during *** establish the correlation between precursor concentration and the corresponding growth ***/DTG predication suggests that tuning precursor temperature and powder ratio can alter their concentration in the vapor,well explaining the formation of Mo_(x)W_(1-x)Se_(2) alloy or MoSe_(2)-WSe_(2) heterostructure at different growth *** on the TG/DTG analysis,we further design and grow a complex MoSe_(2)-Mo_(x)W_(1-x)Se_(2)-WSe_(2) heterostructure and Mo_(x)W_(1-x)Se_(2) monolayer alloys,confirming the validity of TG/DTG prediction in TMD crystal ***,employing TG/DTG to predict the synthesis of two-dimensional materials is of importance to understand the TMD growth behavior and provide guidance to the desired TMD heterostructure formation for future photoelectric devices.

关键词： TG/DTG Mo_(x)W_(1-x)Se_(2)alloys MoSe_(2)-WSe_(2)lateral heterostructures precursor concentration

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Effect of molarity on sol-gel routed nano TiO_(2) thin films

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Journal of Advanced Dielectrics 2017年第6期7卷 57-63页

作者： Stephen Lourduraj Rayar Victor Williams PG and Research Department of Physics St.Joseph’s College(Autonomous)Tiruchirapalli Tamil NaduIndia

The nanostructured titanium dioxide(TiO_(2))thin films have been prepared for the molar concentrations of titanium tetra isopropoxide(TTIP)0.05 M,0.1 M,0.15 M and 0.2 M by sol-gel routed spin coating technique with calcination at 450℃.The processing parameters such as,pH value(8),catalyst HCl(0.1 ml),spin speed(3000 rpm)and calcination temperature(450℃)are *** crystalline nature and surface morphology were analyzed by XRD,SEM and AFM *** XRD results confirm that the films are crystalline with anatase phase,and are *** SEM micrographs of the TiO_(2) film reveal the spherical nature of the *** analysis establishes that the uniformity of the TiO_(2) thin film was optimized at 0.2 *** optical measurements show that the transmittance depends on the molarity,and the optical band gap energy of TiO_(2) films is found to be inversely proportional to *** I-V characteristics exhibit that the molarity strongly influences the electrical conductivity of the *** results indicate that the significant effect of molarity on structural,optical and electrical properties of the nanostructured TiO_(2) thin films will be useful to photovoltaic application.

关键词： TiO_(2)thin film titanium tetra isopropoxide sol-gel precursor concentration calcination temperature

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