碳纳米管ZnO纳米复合体的制备和表征

物理化学学报(Wuli Huaxue Xuebao )

Acta Phys.鄄Chim.Sin .,2007,23(2)：145-151

Received:August 9,2006;Revised:November 7,2006.English edition available online at

∗

Corresponding author.Email:qingchen@;Fax:+8610⁃62757555.国家自然科学基金委国际合作项目(60440420450)、高等学校博士学科点专项科研基金(20050001055)和新世纪优秀人才支持计划资助

ⒸEditorial office of Acta Physico ⁃Chimica Sinica

[Article]

February 碳纳米管/ZnO 纳米复合体的制备和表征

杨闵昊

梁涛彭宇才陈

清∗

(北京大学电子学系,纳米器件物理与化学教育部重点实验室,北京

100871)

摘要：

通过将不同直径的ZnO 纳米颗粒与碳纳米管连接制备了碳纳米管/ZnO 纳米复合体.将团聚的ZnO 纳

米颗粒分散并用表面活性剂CTAB 使纳米颗粒带正电.化学氧化碳纳米管使其带负电.ZnO/CTAB 微团通过碳管表面羧基与CTAB 的静电作用与碳纳米管连接形成纳米复合体.研究了复合体形成的不同实验条件,表征了碳纳米管/ZnO 纳米复合体的结构并研究了纳米复合体的光学特性.研究表明,与碳纳米管连接的ZnO 纳米颗粒是互不连接的并保持量子点的特性.光致发光研究表明ZnO 纳米颗粒的激发在纳米复合体中有淬灭.关键词：ZnO ；碳纳米管；纳米复合体中图分类号：O648

Synthesis and Characterization of a Nanocomplex of ZnO

Nanoparticles Attached to Carbon Nanotubes

YANG Min ⁃Hao LIANG Tao PENG Yu ⁃Cai CHEN Qing ∗

(Key Laboratory for the Physics and Chemistry of Nanodevices of the Ministry of Education,Department of Electronics,

Peking University,Beijing 100871,P.R.China )Abstract ：A CNT/ZnO nanocomplex was fabricated by attaching ZnO nanoparticles with various diameters to carbon nanotubes (CNTs).The as ⁃prepared agglomerate ZnO nanoparticles were dispersed and positively charged by utilizing a cationic surfactant cetyltrimethylammonium bromide (CTAB).ZnO/CTAB micelles were subsequently anchored to the surface of CNTs by electrostatic interaction between carboxyl groups on the chemically oxidized nanotubes ′sidewalls and CTAB molecules.Different experimental conditions for the attachment were studied.The CNT/ZnO nanocomplex was characterized using structural and optical analysis methods.ZnO nanoparticles attached to the carbon nanotubes were found to be separated from each other maintaining characteristics of quantum dots Photoluminescence study showed that the emission of ZnO nanoparticles was quenched in the nanocomplex.Key Words ：ZnO ；Carbon nanotube ；Nanocomplex

Due to their unique physical and chemical properties,car-bon nanotubes (CNTs)have broad applications in nanoelectron-ics [1-6],catalysis [7],sensors [8,9],and biosensors [10].Attaching nanopar-ticles to nanotube sidewalls is expected to enhance the CNT ap-plications as in catalysis,fuel cells,or sensors.Various ap-proaches for CNT/nanoparticle complexes have been suggested,such as physical evaporation [9],chemical reaction with functional ized CNTs [11-16].Materials that have been attached to CNTs in-clude gold [12-14,17,18],platinum [7,14],and palladium [9,19]nanoparticles [15,16],proteins and small biomolecules [20],polymers [21],CdSe ⁃ZnS core ⁃

shell nanocrystals [22],and ZnO clusters [23,24].

ZnO is a wide band gap (3.37eV)semiconductor having broad applications in room temperature ultraviolet lasing,chem-ical sensors,photovoltaics,piezoelectric transducers,and single electron transistors [25-28].ZnO nanoparticles have been extensive-ly studied over the past years because of their size ⁃dependent electronic and optical properties [25,26].Combining ZnO nanoparti-cles with CNTs is expected to produce materials with enhanced electronic and optical properties.A couple of groups have start-ed to explore this direction very recently.ZnO nanoparticles

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