tailieunhanh - Báo cáo hóa học: " Binary Mixtures of SH- and CH3-Terminated Self-Assembled Monolayers to Control the Average Spacing Between Aligned Gold Nanoparticles"

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: Binary Mixtures of SH- and CH3-Terminated Self-Assembled Monolayers to Control the Average Spacing Between Aligned Gold Nanoparticles | Nanoscale Res Lett 2009 4 1319-1323 DOI S11671-009-9399-2 NANO EXPRESS Binary Mixtures of SH- and CH3-Terminated Self-Assembled Monolayers to Control the Average Spacing Between Aligned Gold Nanoparticles Asad Rezaee Laura C. Pavelka Silvia Mittler Received 21 May 2009 Accepted 17 July 2009 Published online 2 August 2009 to the authors 2009 Abstract This paper presents a method to control the average spacing between organometallic chemical vapor deposition OMCVD grown gold nanoparticles Au NPs in a line. Focused ion beam patterned CH3-terminated selfassembled monolayers are refilled systematically with different mixtures of SH- and CH3-terminated silanes. The average spacing between OMCVD Au NPs is demonstrated systematically to decrease by increasing the v v ratio of the thiols in the binary silane mixtures with SH- and CH3-terminated groups. Keywords Average spacing FIB Gold Nanoparticle OMCVD Self-assembly Introduction Along with the other applications recent years have seen a tremendous impact on gold nanoparticle Au NP optical response in biological assays detection labeling and sensing 1 . It is of great importance to observe a pronounced shift in the localized surface plasmon resonance LSPR corresponding to an absorption peak intrinsic to Au NPs upon binding of a material onto Au NPs 2 . A. Rezaee S. Mittler El Department of Physics and Astronomy The University of Western Ontario London ON N6A 3K7 Canada e-mail smittler@ A. Rezaee e-mail arezaee@ L. C. Pavelka Department of Chemistry The University of Western Ontario London ON N6A 5B7 Canada e-mail lcpavelk@ However to achieve such a pronounced LSPR shift when only a minute amount of sample material is available or in a screening approach with many different recognition agents the volume has to be minimized and the accessibility of the analyte to the Au NPs has to be enhanced. Therefore two-dimensional approaches with organometallic chemical vapor deposited OMCVD Au NPs on a surface