共查询到19条相似文献,搜索用时 78 毫秒
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通过水热处理TiO_2纳米管阵列和氧化石墨烯制备石墨烯/TiO_2纳米管薄膜材料,并进一步连续离子沉积BiOBr来制备BiOBr/石墨烯/TiO_2纳米管阵列薄膜材料。利用X射线衍射仪、扫描电子显微镜、X射线电子能谱和紫外-可见漫反射光谱等测试手段对所得样品的物相组成、表面形貌及元素形态和光吸收性能等进行表征。结果表明,TiO_2纳米管的表面成功负载了石墨烯和BiOBr纳米片。紫外-可见漫反射吸收光谱表明,BiOBr和石墨烯共同修饰的TiO_2纳米管的吸收带边发生明显红移,其可见光吸收性能明显提高。光电电化学性能测试表明,BiOBr和石墨烯的共同修饰有效提高了TiO_2纳米管的光电流、光电压和光电转换效率。 相似文献
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采用电化学沉积方法制备CdS/TiO2电极并研究其光电催化性能,比较了不同电压、反应物浓度、不同电解质等条件下CdS/TiO2电极所显示的光电性能。另外,将CdS/TiO2与CdS/Ti电极进行光电性能比较,得出了在相同沉积时间下CdS/TiO2电极的光电性能比CdS/Ti电极稳定,产生的光电流略有提高的结论,在多数方面都优于CdS/Ti电极。 相似文献
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采用脉冲电沉积法将Cu_2O负载至Ti O_2纳米管阵列(NTAs)上,得到能够催化降解甲基橙的光电极。采用X射线衍射仪、扫描电镜和紫外-可见分光光度计表征了Ti O2 NTAs电极的微观结构和光电性能。考察了Cu_2O沉积时间、偏压和光照条件对电极催化降解性能的影响。结果表明,通过脉冲电沉积Cu_2O能有效增强Ti O_2 NTAs的光电活性。Cu_2O沉积时间为40 s时所得电极的性能最好。在电极两端施加适当的偏压能有效增强电极的催化活性。在偏压为0.6 V和可见光照射的条件下,该电极对甲基橙的降解效果最好,降解1 h的脱色率达到66%。 相似文献
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以钛酸丁酯为钛源,通过盐酸调制的两步溶剂热法在FTO基底上制备异质结阵列Bi_2S_3/TiO_2纳米棒。利用XRD、SEM、UV-Vis和电化学工作站等测试手段对Bi_2S_3/TiO_2纳米棒异质结阵列电极的晶体结构、表面形貌、光学和光电化学性质进行了表征。结果表明,经Bi_2S_3敏化后的TiO_2纳米棒阵列薄膜对可见光的吸收明显增强,吸收光波长由400 nm增至700 nm。在标准模拟太阳光(AM 1.5 G,100 m W/cm2)照射下,复合薄膜开路电压为1.06 V,短路电流密度为0.11 m A/cm2,与纯TiO_2纳米棒薄膜相比,光电转化能力显著提高。 相似文献
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采用化学沉淀法制备了CdS包覆TiO2(CdS/TiO2)复合纳米粒子,利用XRD、TEM、SEM、UV-Vis吸收光谱等对其进行了表征分析,并以可见光分解水制氢为探针反应考察了复合纳米粒子的活性。结果表明,CdS/TiO2复合纳米粒子的颗粒大小约为40 nm,TiO2以锐钛矿型存在,CdS以六方相存在;复合纳米粒子的吸收光谱较TiO2发生"红移",大幅拓宽了对可见光区的吸收范围。光解水制氢实验表明,CdS/TiO2复合纳米粒子具有良好的可见光释氢活性和光学稳定性。 相似文献
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以钛酸丁酯为钛源,采用溶胶凝胶法制备了硫/铜共掺杂的锐钛矿型TiO2粉体(S/Cu-TiO2),并通过X射线衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)和N2吸附等手段对其进行了表征;以中性红为模型物考察了其光催化活性。结果表明:在450℃下焙烧2 h得到摩尔分数0.2%S/Cu-TiO2为单一锐钛矿相纳米颗粒,平均粒径为40—70 nm,而于550℃和650℃下焙烧得到的样品中含有部分金红石相,因此,掺杂离子可有效抑制TiO2晶粒的生长,温度高于450℃不利于制备锐钛矿相TiO2;在最优的实验条件下,即在紫外光下达吸附平衡的200 mL质量浓度为20 mg/L的中性红溶液加入0.15 g 0.2%S/Cu-TiO2,紫外光催化降解120 min,此时中性红的降解率达近100%;该催化剂降解中性红的动力学结果显示该过程可由Langmuir-Hinshelwood(L-H)拟一级动力学模型来描述。 相似文献
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The photoelectrochemical behaviour of n-type CdS (polycrystalline) containing small amount of PbS or CdSe in S2? /S2?n redox system has been studied. Mixed polycrystalline n-type CdSPbS electrodes were prepared by electrodeposition and the n-type CdSCdSe electrodes were made by partial replacement of sulphide ions of CdS electrode with selenide ions from a solution of sodium selenosulphate. It has been observed that both the mixed chalcogenide electrodes exhibit better photoresponse than the simple CdS electrode. 相似文献
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Xiaotian Ma Yue Shen Qishuang Wu Tan Shen Meng Cao Feng Gu Linjun Wang 《Journal of Inorganic and Organometallic Polymers and Materials》2013,23(4):798-802
Front-side illuminated CdS quantum dots (QDs) sensitized solar cells (QDSSCs) based on TiO2 nanotube arrays (TNTAs) were fabricated. The free-standing TNTAs (f-TNTAs) membranes were obtained from anodic oxidized Ti foils by self-detaching technique and then transferred to FTO glass substrates to form photoanodes. CdS QDs were loaded on TNTAs by sequential chemical bath deposition approach. Scanning electron microscope (SEM) results indicated that the morphology and structure of TNTAs membranes did not change in detaching and transferring process. Power conversion efficiency of the devices from the front-side illumination mode is 1.47 %, which is much higher than that (0.34 %) of the back-side illumination mode owing to the markedly improved light absorption. 相似文献
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Li Jingjing Guo Chenpeng Li Lihua Gu Yongjun BoK-Hee Kim Huang Jinliang 《Catalysis Letters》2022,152(6):1611-1620
Catalysis Letters - The 1D WO3 nanorod/2D ZnWO4 nanosheet heterojunction arrays were successfully fabricated by combining a facile hydrothermal and in situ solvothermal growth reaction. The... 相似文献
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Yitan Li Lin Wei Xiya Chen Ruizi Zhang Xing Sui Yanxue Chen Jun Jiao Liangmo Mei 《Nanoscale research letters》2013,8(1):67
Narrow bandgap PbS nanoparticles, which may expand the light absorption range to the near-infrared region, were deposited on TiO2 nanorod arrays by successive ionic layer adsorption and reaction method to make a photoanode for quantum dot-sensitized solar cells (QDSCs). The thicknesses of PbS nanoparticles were optimized to enhance the photovoltaic performance of PbS QDSCs. A uniform CdS layer was directly coated on previously grown PbS-TiO2 photoanode to protect the PbS from the chemical attack of polysulfide electrolytes. A remarkable short-circuit photocurrent density (approximately 10.4 mA/cm2) for PbS/CdS co-sensitized solar cell was recorded while the photocurrent density of only PbS-sensitized solar cells was lower than 3 mA/cm2. The power conversion efficiency of the PbS/CdS co-sensitized solar cell reached 1.3%, which was beyond the arithmetic addition of the efficiencies of single constituents (PbS and CdS). These results indicate that the synergistic combination of PbS with CdS may provide a stable and effective sensitizer for practical solar cell applications. 相似文献
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用还原型谷胱甘肽(GSH)作硫源和稳定剂在水相中合成了生物相容性好、量子产率高的核壳型CdTe/CdS半导体量子点;同时模拟人体内生理环境,研究了CdTe/CdS量子点(QDs)对木犀草素与人血清白蛋白(HSA)相互作用的影响。结果表明,CdTe/CdS QDs可有规律地猝灭HSA荧光;在CdTe/CdS QDs存在条件下,木犀草素可使HSA荧光最大发射波长从341 nm红移到347 nm,红移程度明显大于无QDs存在时,同时木犀草素与HSA的表观结合常数和结合位点数均有增加,即CdTe/CdS QDs使木犀草素与HSA的结合力增强。 相似文献
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CdSe:Mn量子点的制备及其光致发光特性研究 总被引:1,自引:1,他引:0
采用低温水热法,以柠檬酸为配位稳定剂制备了Mn2 掺杂的CdSe量子点.用紫外吸收光谱、荧光发射光谱、X射线衍射(XRD)、透射电镜(TEM)等进行了表征.研究了Mn2 掺杂浓度对量子点的结构及其光致发光性能的影响.光致发光光谱表明,当粒子尺寸为3 nm时,在580 nm处出现了属于Mn2 的4T1-6A1跃迁的特征发射峰.当激发波长为480nm时,在630nm处出现了CdSe的表面缺陷发射峰.随着Mn2 的掺杂浓度增大,CdSe:Mn表面陷阱态发射峰位置没有显著红移.TEM分析结果显示,CdSe:Mn量子点为单分散的,尺寸约为5 nm的圆形纳米粒子.当Mn2 离子掺杂浓度不大于5%时,Mn2 取代表面晶格中的Cd2 离子位置形成辐射性表面缺陷,产生表面陷阱态发射.吸收光谱显示,随着量子点变小,吸收带边发生蓝移,显示明显的量子尺寸效应. 相似文献