CAJ | 학술논문

在不加过渡金属做催化剂的前提下,利用化学气相沉积法在二次阳极氧化法制得的多孔氧化铝模板中制备沉积了定取向碳纳米管阵列.考察了不同沉积温度以及退火处理对沉积结果的影响.温度达到600℃以上时,能得到开口的、定取向的多壁碳纳米管阵列;当沉积温度降至550℃左右时,沉积结果中存在碳纳米管、纳米纤维以及类似于弯曲的竹节状的结构;温度继续降低至500'℃以下时,不能得到碳纳米管或碳纳米纤维;从实验结果中可以得出,在氧化铝模板中沉积碳纳米管过程中氧化铝起到了催化乙炔裂解以及催化沉积的碳石墨化成碳纳米管两种作用.另外,退火处理虽然能够提高沉积的碳纳米管的石墨化程度,但是也可能会引入新的缺陷.
재불가과도금속주최화제적전제하,이용화학기상침적법재이차양겁양화법제득적다공양화려모판중제비침적료정취향탄납미관진렬.고찰료불동침적온도이급퇴화처리대침적결과적영향.온도체도600℃이상시,능득도개구적、정취향적다벽탄납미관진렬;당침적온도강지550℃좌우시,침적결과중존재탄납미관、납미섬유이급유사우만곡적죽절상적결구;온도계속강저지500'℃이하시,불능득도탄납미관혹탄납미섬유;종실험결과중가이득출,재양화려모판중침적탄납미관과정중양화려기도료최화을결렬해이급최화침적적탄석묵화성탄납미관량충작용.령외,퇴화처리수연능구제고침적적탄납미관적석묵화정도,단시야가능회인입신적결함.
Well-aligned open-ended multi-walled carbon nanotube (MWCNT) arrays were prepared via chemical vapor deposition (CVD) method in porous anodic aluminum oxide (AAO) templates without depositing any transition metals as catalyst. Effects of the CVD temperature and heat treatment were studied in detail.Well-aligned open-ended MWCNT arrays were obtained at the CVD temperature above 600 ℃; when CVD temperature is reduced to around 550 ℃, CNTs, CNFs and other structures existed at the same time; no CNTs or carbon nanofibres (CNFs) could be found as the CVD temperature is below 500 ℃, and only amorphous carbon in the porous AAO template was found. Experimental results showed that the AAO template is catalytic during the CVD process, and it has the following two effects: to catalyze thermal decomposition of acetylene and to catalyze conversion of carbon decomposed from acetylene into CNTs or CNFs. Heat treatment could improve the graphitization degree, but it might also introduce new defects.