Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: In Situ Generation of Two-Dimensional Au–Pt Core–Shell Nanoparticle Assemblies | Nanoscale Res Lett 2010 5 61-67 DOI S11671-009-9443-2 NANO EXPRESS In Situ Generation of Two-Dimensional Au-Pt Core-Shell Nanoparticle Assemblies Madiha Khalid Natalie Wasio Thomas Chase Krisanu Bandyopadhyay Received 8 July 2009 Accepted 24 September 2009 Published online 14 October 2009 to the authors 2009 Abstract Two-dimensional assemblies of Au-Pt bimetallic nanoparticles are generated in situ on polyethyle-neimmine PEI silane functionalized silicon and indium tin oxide ITO coated glass surfaces. Atomic force microscopy AFM UV-Visible spectroscopy and electrochemical measurements reveal the formation of coreshell structure with Au as core and Pt as shell. The coreshell structure is further supported by comparing with the corresponding data of Au nanoparticle assemblies. Static contact angle measurements with water show an increase in hydrophilic character due to bimetallic nanoparticle generation on different surfaces. It is further observed that these Au-Pt core-shell bimetallic nanoparticle assemblies are catalytically active towards methanol electro-oxidation which is the key reaction for direct methanol fuel cells DMFCs . Keywords Au-Pt Bimetallic Core-shell Nanoparticle Cyclic voltammetry Atomic force microscopy Introduction Nanoparticle assemblies have gained significant attention recently with the intention of comprehending the true potential applications of their unique physical optical and electronic properties 1 . The ultimate aim is to interface M. Khalid N. Wasio T. Chase K. Bandyopadhyay El Department of Natural Sciences University of Michigan Dearborn 4901 Evergreen Road Dearborn MI 48128 USA e-mail krisanu@ these assemblies to microscale and subsequently to macroscale by organizing them into higher-level structures devices and systems with well-defined functionality. Gold-platinum Au-Pt bimetallic nanoparticles as alloy 2 or core-shell structure 3 in particular has attracted increased interest due to its superior performance
