The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Benjamin G. Levine - One of the best experts on this subject based on the ideXlab platform.
-
Do Excited Silicon–Oxygen Double Bonds Emit Light?
The Journal of Physical Chemistry C, 2014Co-Authors: Yinan Shu, Benjamin G. LevineAbstract:Oxidation of the surface of well-passivated silicon nanocrystals introduces defects which dramatically affect the optical properties of the material. One such defect is the silicon–oxygen double bond, which has been implicated as the source of the unusual particle-size-independent S-band photoluminescence of oxidized silicon nanocrystals. Herein, we investigate the photodynamics of this defect by application of a first-principles nonadiabatic molecular dynamics approach to a cluster model containing a silicon–oxygen double bond. Upon excitation, pyramidalization occurs about the double-bonded silicon atom, leading to a conical intersection between the ground and first excited state. This conical intersection facilitates nonradiative decay, resulting in the internal conversion of 7% of the excited population in the first picosecond after excitation. Extrapolation to longer times suggests that nonradiative decay via conical intersection proceeds faster than the microsecond photoluminescence lifetime of sili...
-
do excited silicon oxygen double bonds Emit Light
Journal of Physical Chemistry C, 2014Co-Authors: Yinan Shu, Benjamin G. LevineAbstract:Oxidation of the surface of well-passivated silicon nanocrystals introduces defects which dramatically affect the optical properties of the material. One such defect is the silicon–oxygen double bond, which has been implicated as the source of the unusual particle-size-independent S-band photoluminescence of oxidized silicon nanocrystals. Herein, we investigate the photodynamics of this defect by application of a first-principles nonadiabatic molecular dynamics approach to a cluster model containing a silicon–oxygen double bond. Upon excitation, pyramidalization occurs about the double-bonded silicon atom, leading to a conical intersection between the ground and first excited state. This conical intersection facilitates nonradiative decay, resulting in the internal conversion of 7% of the excited population in the first picosecond after excitation. Extrapolation to longer times suggests that nonradiative decay via conical intersection proceeds faster than the microsecond photoluminescence lifetime of sili...
Yinan Shu - One of the best experts on this subject based on the ideXlab platform.
-
Do Excited Silicon–Oxygen Double Bonds Emit Light?
The Journal of Physical Chemistry C, 2014Co-Authors: Yinan Shu, Benjamin G. LevineAbstract:Oxidation of the surface of well-passivated silicon nanocrystals introduces defects which dramatically affect the optical properties of the material. One such defect is the silicon–oxygen double bond, which has been implicated as the source of the unusual particle-size-independent S-band photoluminescence of oxidized silicon nanocrystals. Herein, we investigate the photodynamics of this defect by application of a first-principles nonadiabatic molecular dynamics approach to a cluster model containing a silicon–oxygen double bond. Upon excitation, pyramidalization occurs about the double-bonded silicon atom, leading to a conical intersection between the ground and first excited state. This conical intersection facilitates nonradiative decay, resulting in the internal conversion of 7% of the excited population in the first picosecond after excitation. Extrapolation to longer times suggests that nonradiative decay via conical intersection proceeds faster than the microsecond photoluminescence lifetime of sili...
-
do excited silicon oxygen double bonds Emit Light
Journal of Physical Chemistry C, 2014Co-Authors: Yinan Shu, Benjamin G. LevineAbstract:Oxidation of the surface of well-passivated silicon nanocrystals introduces defects which dramatically affect the optical properties of the material. One such defect is the silicon–oxygen double bond, which has been implicated as the source of the unusual particle-size-independent S-band photoluminescence of oxidized silicon nanocrystals. Herein, we investigate the photodynamics of this defect by application of a first-principles nonadiabatic molecular dynamics approach to a cluster model containing a silicon–oxygen double bond. Upon excitation, pyramidalization occurs about the double-bonded silicon atom, leading to a conical intersection between the ground and first excited state. This conical intersection facilitates nonradiative decay, resulting in the internal conversion of 7% of the excited population in the first picosecond after excitation. Extrapolation to longer times suggests that nonradiative decay via conical intersection proceeds faster than the microsecond photoluminescence lifetime of sili...
Chong Mou Wang - One of the best experts on this subject based on the ideXlab platform.
-
can clay Emit Light ru bpy 32 modified clay colloids and their application in the detection of glucose
Journal of Electroanalytical Chemistry, 2003Co-Authors: Ping Yi Liang, Pei Wen Chang, Chong Mou WangAbstract:Abstract In this paper, we describe the electrochemiluminescent (ECL) behavior of Ru(bpy) 3 3+ -incorporated clay colloids. Experimental results based on the electrochemical-quartz-crystal-microbalance (EQCM) techniques showed that Ru(bpy) 3 3+ could be adsorbed by the clay colloids (montmorillonite K10, denoted K10). The resulting clay particles could Emit Light ( λ em 610 nm) when they were fabricated as thin films sandwiched by two conductive ITO electrodes with opposite biases. These Ru(bpy) 3 3+ -incorporated clay-modified electrodes could also Emit Light in aqueous oxalate solutions (pH 10) when potentials more positive than 0.9 V vs. SCE were applied. EDTA was an effective promoter for the Ru(bpy) 3 (clay) 3+ -oxalate ECL reaction. The resulting ECL showed a remarkable sensitivity to oxygen. A glucose optrode was thus fabricated based on the Ru(bpy) 3 3+ -incorporated K10 colloids and glucose oxidase (GOx). The ECL signals behaved as a function of [glucose], covering a range from 0.1 to 10 mM at pH 10. The detection limits reached a level of 0.1 mM at this pH.
-
Can clay Emit Light? Ru(bpy)32+-modified clay colloids and their application in the detection of glucose
Journal of Electroanalytical Chemistry, 2003Co-Authors: Ping Yi Liang, Pei Wen Chang, Chong Mou WangAbstract:Abstract In this paper, we describe the electrochemiluminescent (ECL) behavior of Ru(bpy) 3 3+ -incorporated clay colloids. Experimental results based on the electrochemical-quartz-crystal-microbalance (EQCM) techniques showed that Ru(bpy) 3 3+ could be adsorbed by the clay colloids (montmorillonite K10, denoted K10). The resulting clay particles could Emit Light ( λ em 610 nm) when they were fabricated as thin films sandwiched by two conductive ITO electrodes with opposite biases. These Ru(bpy) 3 3+ -incorporated clay-modified electrodes could also Emit Light in aqueous oxalate solutions (pH 10) when potentials more positive than 0.9 V vs. SCE were applied. EDTA was an effective promoter for the Ru(bpy) 3 (clay) 3+ -oxalate ECL reaction. The resulting ECL showed a remarkable sensitivity to oxygen. A glucose optrode was thus fabricated based on the Ru(bpy) 3 3+ -incorporated K10 colloids and glucose oxidase (GOx). The ECL signals behaved as a function of [glucose], covering a range from 0.1 to 10 mM at pH 10. The detection limits reached a level of 0.1 mM at this pH.
Ping Yi Liang - One of the best experts on this subject based on the ideXlab platform.
-
can clay Emit Light ru bpy 32 modified clay colloids and their application in the detection of glucose
Journal of Electroanalytical Chemistry, 2003Co-Authors: Ping Yi Liang, Pei Wen Chang, Chong Mou WangAbstract:Abstract In this paper, we describe the electrochemiluminescent (ECL) behavior of Ru(bpy) 3 3+ -incorporated clay colloids. Experimental results based on the electrochemical-quartz-crystal-microbalance (EQCM) techniques showed that Ru(bpy) 3 3+ could be adsorbed by the clay colloids (montmorillonite K10, denoted K10). The resulting clay particles could Emit Light ( λ em 610 nm) when they were fabricated as thin films sandwiched by two conductive ITO electrodes with opposite biases. These Ru(bpy) 3 3+ -incorporated clay-modified electrodes could also Emit Light in aqueous oxalate solutions (pH 10) when potentials more positive than 0.9 V vs. SCE were applied. EDTA was an effective promoter for the Ru(bpy) 3 (clay) 3+ -oxalate ECL reaction. The resulting ECL showed a remarkable sensitivity to oxygen. A glucose optrode was thus fabricated based on the Ru(bpy) 3 3+ -incorporated K10 colloids and glucose oxidase (GOx). The ECL signals behaved as a function of [glucose], covering a range from 0.1 to 10 mM at pH 10. The detection limits reached a level of 0.1 mM at this pH.
-
Can clay Emit Light? Ru(bpy)32+-modified clay colloids and their application in the detection of glucose
Journal of Electroanalytical Chemistry, 2003Co-Authors: Ping Yi Liang, Pei Wen Chang, Chong Mou WangAbstract:Abstract In this paper, we describe the electrochemiluminescent (ECL) behavior of Ru(bpy) 3 3+ -incorporated clay colloids. Experimental results based on the electrochemical-quartz-crystal-microbalance (EQCM) techniques showed that Ru(bpy) 3 3+ could be adsorbed by the clay colloids (montmorillonite K10, denoted K10). The resulting clay particles could Emit Light ( λ em 610 nm) when they were fabricated as thin films sandwiched by two conductive ITO electrodes with opposite biases. These Ru(bpy) 3 3+ -incorporated clay-modified electrodes could also Emit Light in aqueous oxalate solutions (pH 10) when potentials more positive than 0.9 V vs. SCE were applied. EDTA was an effective promoter for the Ru(bpy) 3 (clay) 3+ -oxalate ECL reaction. The resulting ECL showed a remarkable sensitivity to oxygen. A glucose optrode was thus fabricated based on the Ru(bpy) 3 3+ -incorporated K10 colloids and glucose oxidase (GOx). The ECL signals behaved as a function of [glucose], covering a range from 0.1 to 10 mM at pH 10. The detection limits reached a level of 0.1 mM at this pH.
Oliver G Schmidt - One of the best experts on this subject based on the ideXlab platform.
-
siox si radial superlattices and microtube optical ring resonators
Applied Physics Letters, 2007Co-Authors: R Songmuang, Armando Rastelli, S Mendach, Oliver G SchmidtAbstract:Scanning and transmission electron microscopy reveals that SiOx∕Si layers can roll up into microtubes and radial superlattices on a Si substrate. These hybrid objects are thermally stable up to 850°C and Emit Light in the visible spectral range at room temperature. For tubes disengaged from the substrate surface, optically resonant emissions with mode spacings inversely proportional to the tube diameter are observed and agree excellently with those obtained from finite-difference time-domain simulations. The resonant modes recorded are strictly polarized along the tube axis.
-
siox si radial superlattices and microtube optical ring resonators
arXiv: Materials Science, 2006Co-Authors: R Songmuang, Armando Rastelli, S Mendach, Oliver G SchmidtAbstract:Scanning and transmission electron microscopy reveal that SiOx/Si layers can roll-up into microtubes and radial superlattices on a Si substrate. These hybrid objects are thermally stable up to 850 C and Emit Light in the visible spectral range at room temperature. For tubes disengaged from the substrate surface, optically resonant emission with mode spacings inversely proportional to the tube diameter are observed and agree excellently with those obtained from Finite-Different-Time-Domain simulations. The resonant modes we record are strictly polarized along the tube axis.