Vapor–liquid–solid growth and narrow-band ultraviolet photoluminescence of well-aligned GeO2 nanowire arrays with controllable aspect ratios
Vapor–liquid–solid growth and narrow-band ultraviolet photoluminescence of well-aligned GeO2 nanowire arrays with controllable aspect ratios
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DOI：
10.1007/s00339-010-5789-7
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
Jie Yu;Heqing Yang;Ruyu Shi;Lihui Zhang;Hua Zhao;Xuewen Wang
中科院分区：
文献类型：
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作者：
Jie Yu;Heqing Yang;Ruyu Shi;Lihui Zhang;Hua Zhao;Xuewen Wang
以Au为催化剂，采用气-液-固机制，在空气中热蒸发Ge粉制备了GeO2纳米线阵列。GeO2纳米线是具有六方结构的单晶，其长径比在23-167之间可控。通过调节加热温度和时间，实现了不同长径比的GeO2纳米线阵列的可控合成。在室温下测量了GeO2纳米线阵列的光致发光光谱，首次在347 nm和364 nm处观察到两个紫外发射峰，表明GeO2纳米线阵列在纳米级的光子和电子器件中具有潜在的应用前景。此外，这种气-液-固生长工艺还可以用于合成其他氧化物的高度取向的纳米线阵列，为基础研究和技术应用提供了机会。
GeO2nanowire arrays have been fabricated by thermal evaporation of Ge powder in air via a vapor–liquid–solid mechanism with Au as a catalyst. The GeO2nanowires are single crystalline with a hexagonal structure and have a controllable aspect ratio in the range of 23–167. The controllable synthesis of GeO2nanowire arrays with different aspect ratios was achieved by adjusting the heating temperature and time. Photoluminescence spectra of the GeO2nanowire arrays were measured at room temperature, and two ultraviolet emission peaks at 347 and 364 nm are observed for the first time, which indicates that the GeO2nanowire arrays may have potential applications in nanoscale photonic and electronic devices. Moreover, this vapor–liquid–solid growth process may be employed for synthesis of the highly oriented nanowire arrays of other oxides, and provides opportunities for both fundamental research and technological applications.