title: Inorganic-organic p-n heterojunction nanotree arrays for a high-sensitivity diode humidity sensor.
abstract: Large-area and ordered arrays (16 cm(2)) of an inorganic-organic p-n heterojunction nanotree (NT) were successfully fabricated. The nanotree arrays consist of ZnO nanorods (NRs) as backbones and CuTCNQ (TCNQ = 7,7,8,8-tetracyanoquinodimethane) NRs as branches. The sizes of CuTCNQ NRs can be tuned by the thickness of the Cu layer deposited on the surface of ZnO NR. The CuTCNQ/ZnO NT arrays displayed excellent diode nature and obvious size-dependent rectification ratios were observed. Moreover, the CuTCNQ/ZnO NT arrays were first applied for the fabrication of a diode-type humidity sensor, which displayed ultrahigh sensitivity and quick response/recovery properties at room temperature. The detection limitation of this new diode-type humidity sensor lowers to 5% relative humidity (RH).
authors.affiliation: Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
authors.forename: Ke
authors.initials: K
authors.lastname: Wang
authors.forename: Xuemin
authors.initials: X
authors.lastname: Qian
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Li
authors.forename: Huibiao
authors.initials: H
authors.lastname: Liu
mesh_terms: D003300:Copper / Q000737:chemistry; D004784:Environmental Monitoring / Q000295:instrumentation; D006813:Humidity; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D009570:Nitriles / Q000737:chemistry; D012680:Sensitivity and Specificity; D013227:Steam / Q000032:analysis*; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D009570:Nitriles; D013227:Steam; C013703:tetracyanoquinodimethane; D003300:Copper; D015034:Zinc Oxide