Ibrahim Ruzanna, Hussein Mohd Zobir, Yusof Nor Azah, Abu Bakar Fatimah
Materials Synthesis and Characterization Laboratory (MSCL), Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia.
Functional Devices Laboratory (FDL), Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia.
Nanomaterials (Basel). 2019 Aug 31;9(9):1239. doi: 10.3390/nano9091239.
Carbon nanotube-quicklime nanocomposites (CQNs) have been synthesized via the chemical vapor deposition (CVD) of n-hexane using a nickel metal catalyst supported on calcined carbonate stones at temperatures of 600-900 °C. The use of a Ni/CaO(10 wt%) catalyst required temperatures of at least 700 °C to obtain XRD peaks attributable to carbon nanotubes (CNTs). The CQNs prepared using a Ni/CaO catalyst of various Ni contents showed varying diameters and the remaining catalyst metal particles could still be observed in the samples. Thermogravimetric analysis of the CQNs showed that there were two major weight losses due to the amorphous carbon decomposition (300-400 °C) and oxidation of CNTs (400-600 °C). Raman spectroscopy results showed that the CQNs with the highest graphitization were synthesized using Ni/CaO (10 wt%) at 800 °C with an I/I ratio of 1.30. The cyclic voltammetry (CV) of screen-printed carbon electrodes (SPCEs) modified with the CQNs showed that the performance of nanocomposite-modified SPCEs were better than bare SPCEs. When compared to carboxylated multi-walled carbon nanotubes or MWNT-COOH-modified SPCEs, the CQNs synthesized using Ni/CaO (10 wt%) at 800 °C gave higher CV peak currents and comparable electron transfer, making it a good alternative for screen-printed electrode modification.
通过在600 - 900℃的温度下，使用负载在煅烧碳酸盐石块上的镍金属催化剂对正己烷进行化学气相沉积（CVD），合成了碳纳米管-生石灰纳米复合材料（CQNs）。使用Ni/CaO（10 wt%）催化剂时，需要至少700℃的温度才能获得可归因于碳纳米管（CNTs）的XRD峰。使用不同镍含量的Ni/CaO催化剂制备的CQNs显示出不同的直径，并且在样品中仍可观察到剩余的催化剂金属颗粒。CQNs的热重分析表明，由于无定形碳分解（300 - 400℃）和CNTs氧化（400 - 600℃），存在两个主要的重量损失。拉曼光谱结果表明，使用Ni/CaO（10 wt%）在800℃合成的具有最高石墨化程度的CQNs，其I/I比为1.30。用CQNs修饰的丝网印刷碳电极（SPCEs）的循环伏安法（CV）表明，纳米复合材料修饰的SPCEs的性能优于裸SPCEs。与羧基化多壁碳纳米管或MWNT - COOH修饰的SPCEs相比，使用Ni/CaO（10 wt%）在800℃合成的CQNs给出了更高的CV峰电流和相当的电子转移，使其成为丝网印刷电极修饰的良好替代品。
