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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS · 2015 ·Vol. 27 ·期 3 ·3021-3025 · IF 1.569

A facile method to oxidize p-type Zinc Selenide nanowires into n-type Zinc Oxide nanowires

Zhang Xiwei,Tang Zhenjie,Hu Dan,Wang Zhi,Yu Fengjun,Cui Haitao,Xu Tongshuai,Ju Lin

A facile method was used to oxidize p-type Zinc Selenide (ZnSe) nanowires into n-type Zinc Oxide (ZnO) through a 700 °C annealing process in air. Single crystal ZnSe nanowires, with a hole concentration of 0.805 × 10 18 cm −3 and a negative photoconductivity, were oxidized into polycrystalline ZnO nanowires with an electron concentration of 4.88 × 10 18 cm −3 and a positive photoconductivity. Additionally, both the as-synthesized ZnSe nanowires and the post-oxidized ZnO nanowires presented excellent optoelectronic properties. This method can be used to construct radial p–n junctions or other nano-devices based on a single NW through a regioselective oxidation process.

研究领域: 材料科学 · 纳米技术

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MICROCHIMICA ACTA · 2024 ·Vol. 191 ·期 8 ·1-10 · IF 5.3

Tapered cross-linked ZnO nanowire bundle arrays on three-dimensional graphene foam for highly sensitive electrochemical detection of levodopa

Huang Shuo,Zhang Haopeng,Gao Xin,Su Hang,Lan Jingming,Bai He,Yue Hongyan

It is crucial to accurately and rapidly monitor the levodopa (LD) concentration for accurate classification and treatment of dyskinesia in Parkinson’s disease. In this paper, 3D graphene foam (GF) with a highly conductive network is obtained by chemical vapor deposition. 3D GF serves as the substrate for hydrothermal in situ growth of tapered cross-linked ZnO nanowire bundle arrays (ZnO NWBAs), enabling the development of a highly sensitive detection platform for LD. The formation mechanism of a tapered cross-linked ZnO nanowire bundle arrays on 3D GF is put forward. The integration of 3D GF and ZnO NWBAs can accelerate the electron transfer rate and increase the contact area with biomolecules, resulting in high electrochemical properties. The electrode composed of ZnO NWBAs on 3D GF exhibits significant sensitivity (1.66 µA·µM −1 ·cm −2 ) for LD detection in the concentration range 0–60 µM. The electrode is able to rapidly and specifically determine LD in mixed AA or UA solution. The selectivity mechanism of the electrode is also explained by the bandgap model. Furthermore, the successful detection of LD in serum demonstrates the practicality of the electrode and its great potential for clinical application.

CAS / MDL: 1336-21-6 64-17-5 100-97-0 5970-45-6 10196-18-6 7664-38-2 7647-01-0

研究领域: 材料科学 · 医学 · 生物传感器

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A facile method to oxidize p-type Zinc Selenide nanowires into n-type Zinc Oxide nanowires

Tapered cross-linked ZnO nanowire bundle arrays on three-dimensional graphene foam for highly sensitive electrochemical detection of levodopa