title: Resonant tunneling modulation in quasi-2D Cu(2)O/SnO(2) p-n horizontal-multi-layer heterostructure for room temperature H(2)S sensor application.
abstract: Heterostructure material that acts as resonant tunneling system is a major scientific challenge in applied physics. Herein, we report a resonant tunneling system, quasi-2D Cu(2)O/SnO(2) p-n heterostructure multi-layer film, prepared by electrochemical deposition in a quasi-2D ultra-thin liquid layer. By applying a special half-sine deposition potential across the electrodes, Cu(2)O and SnO(2) selectively and periodically deposited according to their reduction potentials. The as-prepared heterostructure film displays excellent sensitivity to H(2)S at room temperature due to the resonant tunneling modulation. Furthermore, it is found that the laser illumination could enhance the gas response, and the mechanism with laser illumination is discussed. It is the first report on gas sensing application of resonant tunneling modulation. Hence, heterostructure material act as resonant tunneling system is believed to be an ideal candidate for further improvement of room temperature gas sensing.
authors: State key laboratory of Superhard materials, Jilin University , Changchun 130012, PR China.
authors: Guangliang
authors: G
authors: Cui
authors: Mingzhe
authors: M
authors: Zhang
authors: Guangtian
authors: G
authors: Zou
mesh_terms: D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes; D005740:Gases / Q000032:analysis; D006046:Gold / Q000737:chemistry; D006862:Hydrogen Sulfide / Q000032:analysis*; D007834:Lasers; D010084:Oxidation-Reduction; D013696:Temperature; D017971:Tin Compounds / Q000737:chemistry*
chemical_list: D005740:Gases; D017971:Tin Compounds; D006046:Gold; D003300:Copper; C045358:stannic oxide; C030973:cupric oxide; D006862:Hydrogen Sulfide