碘吸附单壁碳纳米管的物理化学性质

Physico-chemical properties of iodine-adsorbed single-walled carbon nanotubes.

作者信息

Hayakawa Chiharu, Urita Koki, Ohba Tomonori, Kanoh Hirofumi, Kaneko Katsumi

机构信息

Department of Chemistry, Graduate School of Science, Chiba University, Chiba 263-8522, Japan.

出版信息

Langmuir. 2009 Feb 3;25(3):1795-9. doi: 10.1021/la803395a.

DOI:10.1021/la803395a

PMID:19123785

Abstract

I2 was adsorbed on single-walled carbon nanotube from ethanol solution at 303 K. The I2 adsorption isotherm was Langmuirian, giving 35 (+/-10) mg g(-1) of the saturated adsorption amount (coverage 0.06-0.09). The I2-adsorption treatment of SWCNT bundles reduced the N2 adsorption amount at 77 K by only 3%; the adsorption amount of supercritical H2 at 77 K was decreased by 30% because of the I2-adsorption treatment, indicating the blocking of interstitial pores by adsorbed I2. These adsorption results indicated the adsorption of I2 molecules in the narrow interstitial pores. The I2-adsorption treatment increases the Raman intensity coming from metallic SWCNTs, and the dc electrical conductivity increased by 15% because of the I2-adsorption treatment, strongly suggesting the presence of charge-transfer interaction between I2 and SWCNTs irrespective of small coverage by I2.

摘要

在303 K下，碘（I₂）从乙醇溶液中吸附到单壁碳纳米管上。I₂的吸附等温线符合朗缪尔等温线，饱和吸附量为35（±10）mg g⁻¹（覆盖度0.06 - 0.09）。对单壁碳纳米管束进行I₂吸附处理后, 在77 K下N₂的吸附量仅减少了3%；由于I₂吸附处理，77 K下超临界H₂的吸附量减少了30%，这表明吸附的I₂堵塞了间隙孔。这些吸附结果表明I₂分子吸附在狭窄的间隙孔中。I₂吸附处理增加了来自金属性单壁碳纳米管的拉曼强度，并且由于I₂吸附处理，直流电导率提高了15%，这有力地表明了无论I₂的覆盖度多小，I₂与单壁碳纳米管之间都存在电荷转移相互作用。