TAILIEUCHUNG - Báo cáo hóa học: " Two novel hierarchical homogeneous nanoarchitectures of TiO2 nanorods branched and P25-coated TiO2 nanotube arrays and their photocurrent performances"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Two novel hierarchical homogeneous nanoarchitectures of TiO2 nanorods branched and P25-coated TiO2 nanotube arrays and their photocurrent performances | Hu et al. Nanoscale Research Letters 2011 6 91 http content 6 1 91 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Two novel hierarchical homogeneous nanoarchitectures of TiO2 nanorods branched and P25-coated TiO2 nanotube arrays and their photocurrent performances s s 1 1 1 1 rv P s 1 1 1 Anzheng Hu Cuixia Cheng1 Xin Li Jian Jiang Ruimin Ding Jianhui Zhu Fei Wu Jinping Liu1 Xintang Huang1 Abstract We report here for the first time the synthesis of two novel hierarchical homogeneous nanoarchitectures of TiO2 nanorods branched TiO2 nanotube arrays BTs and P25-coated TiO2 nanotube arrays PCTs using two-step method including electrochemical anodization and hydrothermal modification process. Then the photocurrent densities versus applied potentials of BTs PCTs and pure TiO2 nanotube arrays TNTAs were investigated as well. Interestingly at V and under the same illumination condition the photocurrent densities of BTs and PCTs show more than and 1 times higher than that of pure TNTAs respectively which can be mainly attributed to significant improvement of the light-absorbing and charge-harvesting efficiency resulting from both larger and rougher surface areas of BTs and PCTs. Furthermore these dramatic improvements suggest that BTs and PCTs will achieve better photoelectric conversion efficiency and become the promising candidates for applications in DSSCs sensors and photocatalysis. Introduction In current years one-dimensional 1D TiO2 nanostructure materials especially nanotubular 1-3 and hierarchical 4-7 nanoarchitecture TiO2 nanotube arrays TNTAs have initiated increasing research interest owing to their intriguing architectures because they possess very high specific surface areas and a dual-channel for the benefit of the ele ctrons transportation from interfaces to electrodes 7-13 . These nanostructure materials have shown very promising applications in dye-sensitized solar cells DSSCs 14-16 .

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