Kim Do-Hyun
J Nanosci Nanotechnol. 2014 Jun;14(6):4557-63. doi: 10.1166/jnn.2014.8285.
This study reports on the morphological characteristics of multi-walled carbon nanotube with multi-vacancy defects (MWCNT-MD) of carbon atoms and shows the potential of MWCNT-MD as a support for metal deposition by decorating Pt nanoparticles (NPs). Multi-carbon vacancies on MWCNT were introduced by oxidizing cobalt oxide-decorated MWCNT at 250 degrees C for 6 h in air by means of carbon gasification reaction, resulting in holes and thinned walls on MWCNT. It was revealed that creating multivacancy defects led to the increase of specific surface area from 107 to 152 m2/g and pore size in the range of 5-8 nm increased on MWCNT compared with that of pristine MWCNT. 30 wt.% Pt was decorated on MWCNT-MD by impregnation method to investigate the effect of carbon vacancies on the degree of Pt dispersion, and the presence of Pt metal was confirmed by X-ray diffraction. Transmission electron microscopy images clearly displayed that Pt NPs with average particle size of 2.8 nm were evenly dispersed on the defective site of holes and thinned walls. This study is clear evidence showing that defective sites of MWCNT are active and good anchor site for metal decoration.
本研究报道了具有多空位缺陷的多壁碳纳米管（MWCNT-MD）中碳原子的形态特征，并展示了MWCNT-MD通过修饰铂纳米颗粒（NPs）作为金属沉积载体的潜力。通过在空气中于250℃下对氧化钴修饰的MWCNT进行6小时的氧化，利用碳气化反应在MWCNT上引入多碳空位，导致MWCNT出现孔洞和壁变薄。结果表明，产生多空位缺陷使比表面积从107增加到152 m²/g，并且与原始MWCNT相比，MWCNT上5-8 nm范围内的孔径增大。通过浸渍法在MWCNT-MD上修饰30 wt.%的Pt，以研究碳空位对Pt分散程度的影响，并通过X射线衍射确认了Pt金属的存在。透射电子显微镜图像清楚地显示，平均粒径为2.8 nm的Pt NPs均匀地分散在孔洞和壁变薄的缺陷部位。这项研究清楚地证明，MWCNT的缺陷部位是金属修饰的活性且良好的锚定部位。
