tailieunhanh - Báo cáo hóa học: " Photoelectrochemical studies of DNA-tagged biomolecules on Au and Au/Ni/Au multilayer nanowires"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Photoelectrochemical studies of DNA-tagged biomolecules on Au and Au/Ni/Au multilayer nanowires | Swaminathan et al. Nanoscale Research Letters 2011 6 535 http content 6 1 535 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Photoelectrochemical studies of DNA-tagged biomolecules on Au and Au Ni Au multilayer nanowires Viswanathan Swaminathan Hwi Fen Liew Wen Siang Lew Lanying Hu and Anh Tuan Phan Abstract The use of nanowires NWs for labeling sensing and sorting is the basis of detecting biomolecules attached on NWs by optical and magnetic properties. In spite of many advantages the use of biomolecules-attached NWs sensing by photoelectrochemical PEC study is almost non-existent. In this article the PEC study of dye-attached single-stranded DNA on Au NWs and Au-Ni-Au multilayer NWs prepared by pulse electrodeposition are investigated. Owing to quantum-quenching effect the multilayer Au NWs exhibit low optical absorbance when compared with Au NWs. The tagged Au NWs show good fluorescence emission at 570 nm indicating significant improvement in the reflectivity. Optimum results obtained for tagged Au NWs attached on functionalized carbon electrodes and its PEC behavior is also presented. A twofold enhancement in photocurrent is observed with an average dark current of 10 gA for Au NWs coated on functionalized sensing electrode. The importance of these PEC and optical studies provides an inexpensive and facile processing platform for Au NWs that may be suitable for biolabeling applications. Introduction Gold Au nanostructures have paved the way to map out a novel platform for designing nano biobarcode for a wide range of biosensing applications 1 . Au nanomaterials such as nanoparticles nanowires NWs and nanorods are the widely studied materials which have great demand in the scientific community 2 3 . Interestingly they offer a number of properties that make them suitable for use in biological applications such as biosensing 4 biosorting 5 and biolabelling 6 . The structure and composition in multilayered gold

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