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利用物理蒸发技术,在半导体性的碳纳米管上沉积钯金属,利用导电原子力显微镜检测钯吸附对碳纳米管电输运的影响.结果表明:沉积的钯在碳纳米管上形成纳米颗粒,随着钯颗粒密度的增加,半导体性碳纳米管逐渐向金属性转变.利用第一性原理计算了吸附有钯原子的半导体性单壁碳纳米管的能带结构.研究发现,钯的覆盖率越高,其禁带宽度越窄,直至为零,定性说明了实验结果的合理性.
Palladium metal was deposited on semiconducting carbon nanotubes by physical evaporation technique and the effect of palladium adsorption on the electrical transport of carbon nanotubes was investigated by means of conductive atomic force microscopy.The results show that the deposited palladium forms nanoparticles on the carbon nanotubes, With the increase of the density of palladium particles, the transition from semiconducting carbon nanotubes to the metallic one was carried out. The energy band structure of the semiconducting SWNTs adsorbed with palladium atoms was calculated by first-principles calculations. High, the narrower its band gap, until zero, qualitatively illustrates the rationality of the experimental results.