Adsorption of Methylene Blue Dye onto Carbon Nanotubes: A Route to an Electrochemically Functional Nanostructure and Its Layer-by-Layer Assembled Nanocomposite

详细信息    查看全文

• 作者：Yiming Yan ; Meining Zhang ; Kuanping Gong ; Lei Su ; Zhixin Guo ; and Lanqun Mao
• 刊名：Chemistry of Materials
• 出版年：2005
• 出版时间：June 28, 2005
• 年：2005
• 卷：17
• 期：13
• 页码：3457 - 3463
• 全文大小：297K
• 年卷期：v.17,no.13(June 28, 2005)
• ISSN：1520-5002

文摘

This paper describes the adsorption of electroactive methylene blue (MB) dye onto single-walled carbonnanotubes (SWNTs) to form an electrochemically functional nanostructure and its layered nanocomposite.UV-visible and FT-IR spectroscopy and electrochemistry used for characterization of the MB adsorptiononto SWNTs reveal that MB essentially interacts with SWNTs through charge-transfer and hydrophobicinteractions, leading to the formation of a MB-SWNT adsorptive nanostructure which exhibits distinctelectrochemical properties from those of MB adsorbed onto a glassy carbon (GC) electrode. The interactionsbetween MB and the SWNTs are demonstrated to closely associate with the structural properties of theSWNTs by comparing the electrochemical properties of MB adsorbed onto different substrates, i.e., glassycarbon, SWNTs, and SWNTs intentionally sidewall functionalized with hydroxyl groups (SWNT-OHs).The stable adsorption of water-soluble and positively charged MB molecules onto the SWNTs is furtherdemonstrated to be able to solubilize the formed nanostructure in water quite well and to fabricate afunctional nanocomposite by layer-by-layer assembling of the formed nanostructure on a solid substrate.