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1.13】Junhong Chen 副教授
题目:Synthesis and...
 
2010-01-07 | 文章来源:SYNL先进炭材料研究部        【 】【打印】【关闭

题 目:Synthesis and Application of Multifunctional Hybrid Nanomaterials

报告人:Junhong Chen 副教授

1 Department of Mechanical Engineering, University of Wisconsin-Milwaukee,Milwaukee, Wisconsin 53211, USA
  2 College of Environmental Science and Engineering, State Key Laboratory ofPollution Control and Resource Reuse, Tongji University, Shanghai 200092, China

时 间:1月13日(周三)10:30-12:00

地 点:李薰楼468会议室

报告摘要:Hybrid nanomaterials comprising nanoparticles (NPs) distributing on the surfaces of carbon nanotubes (CNTs) represent a new class of materials. These materials could potentially display not only the unique properties of NPs and those of CNTs, but also additional novel properties due to the interaction (e.g., electronic or optical) between the NP and the CNT. Such hybrid NP-CNT structures are promising for various innovative technological applications, including chemical sensors, biosensors, water purification, nanoelectronics, photovoltaic cells, fuel cells, hydrogen storage, and lithium ion batteries.

My talk includes two parts. In the first part, I will introduce a material-independent, dry route based on the electrostatic force directed assembly (ESFDA) to assemble aerosol NPs onto CNTs to form NP-CNT hybrid structures. The method takes advantage of the small diameter of CNTs for a significantly enhanced electric field near the CNT surface, which facilitates the attraction of the oppositely-charged aerosol NPs synthesized using an arc plasma source. The ESFDA technique works for both random CNTs and aligned CNT arrays without the need for chemical functionalization or other pretreatments of CNTs. The areal density and the size distribution of NPs on the CNT can be controlled. Moreover, the non-covalent attachment of NPs also preserves the intrinsic properties of CNTs. Due to the inherent material-independence nature of the electrostatic force, various compositions of such NP-CNT hybrid structures can be produced using this technique.

In the second part, I will present example applications of hybrid nanomaterials, such as the detection of chemical and biological species and water treatment. Through the combination of high-performance CNTs and nanoparticles of popular sensing materials, the hybrid nanostructures exhibit high sensitivity to low-concentration chemical and biological species at room temperature. Water treatment is explored through the use of photoactive TiO2 nanorods decorated with Ag nanoparticles, which act as electron scavengers and can effectively suppress the electron-hole recombination. Photocatalytic activities of TiO2 nanorods are significantly enhanced due to the charge-separation effect that increases the lifetime of the photogenerated excitons.

Welcome to attend! 

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