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  • 學位論文

硒化鋅奈米顆粒包覆矽線陣列異質結構與銅氧化物之微結構的製備與應用研究

The Synthesis and Applications of Heterostructured ZnSe Nanoparticles/Si Wires Arrays and Cu-Oxide Microstructures

指導教授 : 陳力俊

摘要


本論文包括:硒化鋅奈米顆粒包覆矽線陣列異質結構、銅氧化物之三維構造的製備,及其具有獨特的性質與應用之研究。在p型的矽基板上成長矽線陣列,並包覆硒化鋅的奈米顆粒;此異質結構呈現良好的光偵測及光催化表現。使用結合奈米球微影法及催化蝕刻法,得到規則一致的矽線陣列;硒化鋅以化學水浴法成長包覆於矽線陣列外層。以化學水浴法成長的硒化鋅奈米顆粒,此法具有不含鎘、簡單、快速、且包覆均勻的優點。在施加小電壓條件下,此方法得到的三維硒化鋅奈米顆粒包覆矽線陣列異質結構具有良好的光偵測表現,光電流反應的歸納於此元件具有高比表面積和快速的傳導途徑。三維硒化鋅奈米顆粒包覆矽線陣列異質結構亦於光催化活性上,降解甲基藍等染料之表現優異。 銅的氧化物一向備受矚目,本研究使用一個低溫簡單的方法,不需使用介面活性劑及模板,可由銅片上成長出三維藍色的氫氧化銅微米花簇後;藉由控制退火的溫度與升溫速度可得到黑色的二價氧化銅與暗紅色的一價氧化亞銅微米花簇。三維藍色的氫氧化銅微米花簇成長的條件與溫度及鹼性反應水溶液的濃度有關。氫氧化銅、氧化銅、氧化亞銅樣品的表面形貌、結構和熱分析,藉掃瞄式電子顯微鏡、原位加熱X光能量散射儀、穿透式電子顯微鏡、熱重分析儀分析。三維氧化銅微米花簇並用來偵測葡萄糖的濃度,具有快速的反應時間、高靈感度及適當的線性範圍。此良好表現歸納於三維氧化銅微米花簇結構以低溫濕式化學反應穩固成長微結構於銅基板上,而具有良好的傳導性。

並列摘要


Three dimensional material systems of heterostructured ZnSe nanoparticles/Si wires arrays and Cu-oxide micro flower clusters on Cu foil with unique properties and corresponding applications have been investigated. P-type micron size silicon wire (SiW) arrays coated with ZnSe nanoparticles (NPs) exhibiting enhanced photodetection and photocatalytic performances were synthesized. The SiWs were grown by combining catalytic etching with nanosphere lithography methods. ZnSe NPs were coated on SiWs with a chemical bath deposition (CBD) method. The high photodetection performance of three-dimensional (3D) heterostructured ZnSe NPs/SiWs arrays with immediate decay (> 99.85%), on/off ratio (> 7 × 10 2) and photoresponse speed (< 0.4 s) were recorded under a small applied voltage (80 μV). The immediate decay and on/off ratio increase with decreasing applied voltage and the photocurrent variations of ZnSe NPs/SiWs were larger than 0.3 μA at 1 V. The enhanced UV photocurrent response is attributed to large surface-to-volume ratio and presence of the fast conductive pathway of ZnSe NPs/SiWs shell/core heterostructures. ZnSe NPs/SiWs also showed superb photocatalytic properties with methylene blue (MB) and acid fuchsin (AF) as reagents. The photodegradation data exhibited high activities of 88% and 83% after 120 and 110 min, respectively. The CBD of ZnSe NPs on SiWs provides a facile route for the fabrication of well aligned 3D heterostructured ZnSe NPs/SiWs arrays with a high on/off ratio photocurrent and photocatalytic activity. Cu(OH)2, CuO, and Cu2O micro flower clusters on Cu foil were synthesized by a facile chemical method. Three dimensional self-assembled micro flower cluster structures were formed at a low temperature (5 °C) without utilizing surfactant and template. The growth of robust Cu(OH)2 micro flower clusters/Cu foil strongly depends on the growth temperature and alkaline concentration. The robust Cu(OH)2 micro flower clusters was transformed to CuO or Cu2O at a controlled temperature on Cu substrate. The morphologies, structures, and thermal properties of Cu(OH)2, CuO and Cu2O micro flower clusters were examined by scanning electron microscopy, in-situ X-ray energy dispersive spectrometer, transmission electron microscopy, and thermo-gravimetric analyzer/differential thermal analyzer. Cyclic voltammetry is demonstrated to be a good electrochemical technique for the non-enzymatic detection of glucose. The CuO micro flower clusters/Cu foil electrode presents a fast amperometric response time (1.5 s), high sensitivity (3.3 mA/mM) and appropriate linear range (0.25 μM to 1.0 mM) for glucose detection.

參考文獻


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