稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2009年
z2期
967-969
,共3页
郭钢锋%李晓伟%冯文%孔向阳
郭鋼鋒%李曉偉%馮文%孔嚮暘
곽강봉%리효위%풍문%공향양
防伪材料%光致发光%氮化硅%纳米线%有机前驱体
防偽材料%光緻髮光%氮化硅%納米線%有機前驅體
방위재료%광치발광%담화규%납미선%유궤전구체
anti-counterfeit materials%photoluminescence%silicon nitride%nanowires%polymeric precursor
在高纯氮气气氛中采用有机前驱体热解法合成了氮化硅纳米线,对氮化硅纳米线所进行的详细的微观表征表明它们具有良好的单晶特性,其生长沿着α-Si_3N_4的[1010]方向并受VS机制所控制.在室温下用325 nm激光对样品激发,观察到样品有很宽的强光致发光带,在实验中用肉眼即能观察到从样品所发出的强光.考虑到通过稀土掺杂(如引入Nd、Eu、Er和Yb)等手段能够降低氮化硅纳米结构的能带从而进一步调控其光学性能,可以相信氮化硅纳米线在防伪发光材料领域将有着广阔的开发潜力.
在高純氮氣氣氛中採用有機前驅體熱解法閤成瞭氮化硅納米線,對氮化硅納米線所進行的詳細的微觀錶徵錶明它們具有良好的單晶特性,其生長沿著α-Si_3N_4的[1010]方嚮併受VS機製所控製.在室溫下用325 nm激光對樣品激髮,觀察到樣品有很寬的彊光緻髮光帶,在實驗中用肉眼即能觀察到從樣品所髮齣的彊光.攷慮到通過稀土摻雜(如引入Nd、Eu、Er和Yb)等手段能夠降低氮化硅納米結構的能帶從而進一步調控其光學性能,可以相信氮化硅納米線在防偽髮光材料領域將有著廣闊的開髮潛力.
재고순담기기분중채용유궤전구체열해법합성료담화규납미선,대담화규납미선소진행적상세적미관표정표명타문구유량호적단정특성,기생장연착α-Si_3N_4적[1010]방향병수VS궤제소공제.재실온하용325 nm격광대양품격발,관찰도양품유흔관적강광치발광대,재실험중용육안즉능관찰도종양품소발출적강광.고필도통과희토참잡(여인입Nd、Eu、Er화Yb)등수단능구강저담화규납미결구적능대종이진일보조공기광학성능,가이상신담화규납미선재방위발광재료영역장유착엄활적개발잠력.
The present work synthesized Si_3N_4 nanowires by polymeric precursor pyrolysis in pure N_2 atmosphere. Micro-characterization reveals as-synthesized Si_3N_4 nanowires are single crystalline and grow along [10-10]. The vapor-solid (VS) process should be the dominant growth mechanism. Photoluminescence (PL) measurement was performed at room temperature using a HeCd laser with an excitation wavelength of 325 nm. Si_3N_4 nanowires exhibit intensive and broad emission. This intensive light emission can be observed even with the naked eye. considering that the mid-gap levels of Si_3N_4 can be easily tailored by rare-earth doping (such as Nd, Eu, Er and Yb), Si_3N_4 nanowires could have great potential for the research on anti-counterfeit luminescent materials.