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Rutile Nanorod/Anatase Nanowire Junction Array as Both Sensor and Power Supplier for High‐Performance, Self‐Powered, Wireless UV Photodetector
Author(s) -
Yu Xin,
Zhao Zhenhuan,
Zhang Jian,
Guo Weibo,
Qiu Jichuan,
Li Deshuai,
Li Zhou,
Mou Xiaoning,
Li Linlin,
Li Aixue,
Liu Hong
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201503388
Subject(s) - materials science , nanorod , anatase , photodetector , photodetection , nanowire , heterojunction , rutile , responsivity , optoelectronics , nanotechnology , nanostructure , quantum efficiency , photocatalysis , chemical engineering , chemistry , biochemistry , engineering , catalysis
Self‐powered UV photodetectors based on TiO 2 nanotree arrays have captured much attention in recent years because of their many advantages. In this work, rutile/anatase TiO 2 (R/A‐TiO 2 ) heterostructured nanotree arrays are fabricated by assembling anatase nanowires as branches on rutile nanorods. External quantum efficiencies as high as 90% are reached at 325 nm. These high quantum efficiencies are related to the higher amount of light harvesting due to the larger surface area, the better separation ability of the photogenerated carriers by the rutile/anatase heterostructure, and the faster electron transport, related to the 1D nanostructure and lattice connection at the interface of the two kinds of TiO 2 . Furthermore, a self‐powered wireless UV photodetector is shown with excellent wireless detection performance. Such devices will enable significant advances for next‐generation photodetection and photosensing applications.