目前一般使用的照明設備，多數會隨著發光過程產生熱，使得全球廢熱增加，且發光效率不高造成能源的浪費，令我們生存的環境更加的惡化；廢棄的日光燈管也造成了汞污染等的問題，因此開發具有體積小、無水銀污染、壽命長、耗能少、發光效率高等優點之半導體發光二極體是節約能源的必然趨勢。
本研究利用化學溶膠法配合微波加熱法，微波加熱快速達到高溫及迅速冷卻終止反應，使反應在高成核與低成長的條件下進行。利用N,N -二甲基甲醯胺作反應溶劑，將微波反應生成的硫化鎘穩定分散在其中，形成穩定的膠體溶液。探討不同微波時間(溫度)、前趨物濃度及反應溶劑組成對粒徑之影響。利用電噴霧法噴出含有硫化鎘奈米微粒的帶電液滴，經高溫爐將液體蒸發，奈米微粒由電場收集器收集在矽基板上，根據微粒電移率的不同，在特定電壓下收集特定大小的微粒製成薄膜。微粒的分析利用UV及PL量測吸收與發光波長，TEM決定粒子大小；薄膜分析則利用SEM觀察表面型態及EDS分析薄膜組成。
利用微波加熱能簡便安全的製備出2.6nm到3.7nm的奈米硫化鎘微粒。利用電場收集器收集粒徑在5nm以下的硫化鎘薄膜，收集的薄膜並不緻密，且粒徑都比預設的收集粒徑大。

Light-emitting diodes (LEDs) have the advantages of small volume, long lifetime, no mercury pollution, low energy loss, and high emission efficiency. Developments of LEDs not only serve to improve the disadvantages of traditional illuminants but also save the energy and protect the environment of the world.
In the study, CdS nanoparticles are synthesized by sol-gel method assisted with microwave heating. The microwave assisted heating has been used to control the nucleation rate and growth rate of nanoparticles. Stable colloidal CdS solution was prepared using DMF as solution. We study the influence of reaction temperature, precursor concentration and solvent on the size of CdS nanoparticles. CdS thin films were prepared by electrospraying CdS particles contained solution with the assistance of an electrostatic collector. Particles of a specific diameter were collected for a specific voltage according to their mobility. The size of nanoparticles was analyzed by TEM. Optical properties of CdS nanoparticles were observed with UV and PL spectrometer. Thin film morphology was analyzed by SEM.
Using microwave heating to prepare nanoparticles is a simple, safe and easy to control. The experimental results show that the smallest CdS nanoparticle size is 2.6nm. CdS thin films with a grain size less than 5nm wrer prepared with the assistance of electrostatic collector. The results show that the thin films were not very compact and the particle size is larger than we set to collect.

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