Ấn phẩm:
Temperature-mediated Phase Transformation and Optical Properties of Tungsten Oxide Nanostructures Prepared by Facile Hydrothermal Method
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Tóm tắt
Different tungsten oxide nanocrystals were synthesized via a facile hydrothermal process – one step and free of additives - at different reaction temperatures and in a highly acidic environment. The phase transformation of samples, followed by the change of morphology and optical band gap, was observed as the reaction temperature varied from room temperature (23˚C) to 220˚C. The crystal phase transformed from monoclinic WO3 · 2H2O to orthorhombic WO3 · H2O, then to monoclinic WO3 when the reaction temperature increased from room temperature to 100˚C, then to 220˚C, respectively. Corresponding to the phase transformation, the optical band gap increased from 2.43 eV to 2.71 eV, and the morphology varied from nanoplate to nanocuboid. The effect of the reaction temperature on the phase transformation was assigned to the dehydration process, which became stronger as the reaction temperature increased. These results gave an insight into the phase transformation and implied a simple method for manipulating the crystal phase and morphology of tungsten oxide nanostructures for various applications.
Mô tả
Communications in Physics, Vol. 32, No. 3
Tác giả
Pham, Ngoc Linh
Luu, Thi Lan Anh
Nguyen, Thi Tuyet Mai
Pham, Van Thang
Nguyen, Huu Lam
Nguyen, Cong Tu
Người hướng dẫn
Nơi xuất bản
Nhà xuất bản
Viện Vật lý, Viện Hàn lâm Khoa học và Công nghệ Việt Nam
Năm xuất bản
2022-06
ISSN tạp chí
Nhan đề tập
Từ khóa chủ đề
Tungsten oxide , Phase transformation , Reaction temperature , Optical band gap , Facile hydrothermal method
URI
Tài liệu tham khảo
Thông tin bản quyền
Tệp tin
Ngoc Linh Pham, Thi Lan Anh Luu, Thi Tuyet Mai Nguyen, Van Thang Pham, Huu Lam Nguyen, Cong Tu Nguyen.pdf
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