奈米鑽石之紅外線光譜研究

Infrared Spectroscopic Studies of Nanocrystal Diamonds

陳啓峰(C. F. Chen) ； 鄭嘉良(C. L. Cheng) ； 吳慶成(C. C. Wu)

《材料科學與工程》 35卷3期 (2003/09) Pp. 187-192

摘要

本研究是藉由傅立葉紅外線光譜儀來觀察高溫／高壓法所生成的100nm奈米鑽石，並利用微波氫電漿或熱燈絲所產生的氫原子去氫化／蝕刻奈米鑽石，再觀察其表面的C-H振動光譜。我們並通入有機氣體與奈米鑽石表面進行環添加反應，並與外太空中所觀察到的未定義紅外線發射頻帶相比較。
此外，研究顯示奈米鑽石的粒徑與紅外線吸收光譜並無絕對的關係，這個研究希望提供一個充份的證據說明外太空中的奈米鑽石即使粒徑較小，其紅外線吸收光譜也有可能會與實驗室中觀察到的100nm的奈米鑽石的紅外線吸收光譜相似。

關鍵字

傅立葉紅外線光譜儀 ； 奈米鑽石 ； 未定義紅外線發射頻帶 ； 氫化 ； 氫蝕刻

並列摘要

This research investigated the nanometer-sized diamond particles created from both high temperature/high pressure and detonation methods by using Fourier Transform Infrared Spectroscopy (FTIR). Nanodiamonds were hydrogenated/etched via microwave plasma or hot filament generated atomic hydrogen, and C-H vibrational spectra on the surfaces were measured. Cycloaddition reactions on diamond surfaces conducted with the addition of organic gases. The resulting spectra were compared to the Unidentified Infrared Emission Bands (UIBs) that observed in the interstellar medium.
Size-dependent IR spectra revealed that these spectra were independent on the size of the nanodiamonds. This investigation wish to provide unambiguous evidence that nanodiamonds particles exist in the interstellar medium, and its IR spectra were similar to that of 100 nm diamonds that wee observed in the laboratory.

並列關鍵字

FTIR ； Nanodiamonds ； UIBs ； Hydrogenated ； Hydrogen etching