摘要
单壁碳纳米管SWNTS(single-walled carbon nanotubes)经焙烧和浓盐酸纯化处理后,使用Fenton试剂对碳管进行化学改性处理,研究羟基自由基(·OH)对碳管表面和结构的影响,并运用红外光谱(FTIR)和拉曼光谱(Raman)进行了表征.FTIR结果表明,改性后碳管结构中主要引入羟基和羰基等含氧官能团;Raman光谱分析表明,随着处理时间的不断增加,单壁碳管D线和G线的强度之比即ID/IG的比值也不断增加.根据改性前后碳管的FTIR和Raman光谱变化,探讨了·OH与单壁碳管作用的可能机理.机理分析表明,这些含氧官能团可以看作是具有强亲电性和强氧化性的·OH对碳管上缺陷位置和不饱和键进行攻击的结果.
After purification pretreatment by heating in nanotubes （SWNTs） were treated with Fenton＇s reagents to air and concentrated HC1, single-walled carbon investigate the effect of hydroxyl radical （·OH） on the surface and structure of SWNTs. Fenton oxidation process was followed and characterized by using Fourier transform infrared spectroscopy （FFIR） and Raman spectroscopy. The results of FFIR spectra confirmed that the original graphene structure was disordered / destroyed by the newly generated oxygen-containing functional groups including hydroxyl groups and carbonyl groups after Fenton chemical treatment. Raman spectral analyses showed that the intensity ratio of D lines and G lines （ID/IG） of the SWNTs samples increased gradually with the increase of oxidative treating time. Finally, the possible mechanism of reaction between hydroxyl radical （＇OH） and SWNTs by FFIR and Raman spectral changes before and after Fenton modification treatment was discussed. The possible mechanism indicated that the existence of oxygen-containing functional groups could be viewed as outcome of attacks of hydroxyl radical with both the properties of oxidizability and electrophilic addition on defect sites and unsaturated bonds in the SWNTs samples.
出处
《河南科学》
2007年第4期557-560,共4页
Henan Science
基金
上海市纳米科技专项基金资助项目(0252nm011)
关键词
单壁碳纳米管
·OH
FTIR光谱
RAMAN光谱
机理
single-walled carbon nanotubes （SWNTs）
hydroxyl radical
FTIR spectra
Raman spectra
mechanism
