Browsing by Author "Vo-Dinh, T"
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Item Open Access A highly sensitive Raman method for selective cyanide detection based on evaporated cuprous iodide substrate(Analytical Methods, 2010-05-01) Gopal Reddy, CV; Yan, F; Zhang, Y; Vo-Dinh, TA strong interaction between cyanide anion and copper(i) cation in combination with non-resonant Raman fingerprinting allows the selective sensing of aqueous free cynanide with high sensitivity to parts per billion (ppb)-level. © The Royal Society of Chemistry 2010.Item Open Access Photoelectrocatalysis: Principles, nanoemitter applications and routes to bio-inspired systems(Energy and Environmental Science, 2010-06-11) Lewerenz, HJ; Heine, C; Skorupska, K; Szabo, N; Hannappel, T; Vo-Dinh, T; Campbell, SA; Klemm, HW; Muñoz, AGAn overview on processes that are relevant in light-induced fuel generation, such as water photoelectrolysis or carbon dioxide reduction, is given. Considered processes encompass the photophysics of light absorption, excitation energy transfer to catalytically active sites and interfacial reactions at the catalyst/solution phase boundary. The two major routes envisaged for realization of photoelectrocatalytic systems, e.g. bio-inspired single photon catalysis and multiple photon inorganic or hybrid tandem cells, are outlined. For development of efficient tandem cell structures that are based on non-oxidic semiconductors, stabilization strategies are presented. Physical surface passivation is described using the recently introduced nanoemitter concept which is also applicable in photovoltaic (solid state or electrochemical) solar cells and first results with p-Si and p-InP thin films are presented. Solar-to-hydrogen efficiencies reach 12.1% for homoepitaxial InP thin films covered with Rh nanoislands. In the pursuit to develop biologically inspired systems, enzyme adsorption onto electrochemically nanostructured silicon surfaces is presented and tapping mode atomic force microscopy images of heterodimeric enzymes are shown. An outlook towards future envisaged systems is given. © 2010 The Royal Society of Chemistry.Item Open Access Surface-enhanced Raman scattering nanosensors for in vivo detection of nucleic acid targets in a large animal model(Nano Research, 2018-08-01) Wang, HN; Register, JK; Fales, AM; Gandra, N; Cho, EH; Boico, A; Palmer, GM; Klitzman, B; Vo-Dinh, T© 2018, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. Although nanotechnology has led to important advances in in vitro diagnostics, the development of nanosensors for in vivo detection remains very challenging. Here, we demonstrated the proof-of-principle of in vivo detection of nucleic acid targets using a promising type of surface-enhanced Raman scattering (SERS) nanosensor implanted in the skin of a large animal model (pig). The in vivo nanosensor used in this study involves the “inverse molecular sentinel” detection scheme using plasmonics-active nanostars, which have tunable absorption bands in the near infrared region of the “tissue optical window”, rendering them efficient as an optical sensing platform for in vivo optical detection. Ex vivo measurements were also performed using human skin grafts to demonstrate the detection of SERS nanosensors through tissue. In this study, a new core–shell nanorattle probe with Raman reporters trapped between the core and shell was utilized as an internal standard system for self-calibration. These results illustrate the usefulness and translational potential of the SERS nanosensor for in vivo biosensing. [Figure not available: see fulltext.].