个人简介

Ph.D. 1998, Cornell University

研究领域

Physical and Biophysical Chemistry: Nanoscale Materials and Devices

Our main research area concerns understanding the fundamental properties of materials with a size in between individual molecules and macroscopic objects. These nanometer scale materials have physical characteristics that are strong functions of their size and shape, with properties that can be easily manipulated to address a given application. Our investigations in this area are currently focused on fundamental photophysical studies of carbon nanotubes and semiconductor nanocrystal quantum dots, and the integration of these materials into novel devices for conversion of solar energy into sustainable fuels. These studies are highly interdisciplinary, and lie at the interface between chemistry, optics, physics, applied physics, and materials science. Carbon nanotubes consist of a hexagonal network of carbon atoms rolled up into a cylinder. Nanotubes are typically tens to hundreds of microns long, while their diameter is usually only around 1 nanometer. The quantum confinement of electrons around the nanotube results in unexpected properties. For example, carbon nanotubes can be either metallic or semiconducting, depending on the diameter and helicity of the carbon lattice. We are concerned with determining fundamental electronic and optical characteristics of single carbon nanotubes, as well as the design of carbon nanotube membranes for artificial photosynthesis applications (Figure 1). These investigations are carried out using atomic force microscopy, as well as single molecule and ultrafast optical spectroscopy.

近期论文

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Smyder, J., Peterson, J.J., Amori, A., Krauss, T. D. "The Influence of Continuous vs. Pulsed Laser Excitation on Single Quantum Dot Photophysics," Phys. Chem. Chem. Phys. 2014, DOI: http://dx.doi.org/10.1039/C4CP01395F. Schäfer, S., Cogan, N.M., Krauss, T. D. "Spectroscopic investigation of electrochemically charged individual (6,5) single walled carbon nanotubes," Nano Lett. 2014, 14, 3138-3144. Cogan, N.M.B., Bowerman, C.J., Nogaj, L.J.,Nilsson, B.L., Krauss, T. D. "Selective Suspension of Single-Walled Carbon Nanotubes using β-Sheet Polypeptides," J. Phys. Chem. C 2014, 118, 5935-5944. Pilgrim, G.A., Leadbutter, J.W., Qiu, F., Siitonen, A.J., Pilgrim, S.M., Krauss, T. D. "Electron Conductive and Proton Permeable Vertically Aligned Carbon Nanotube Membranes," Nano Lett. 2014, 14, 1728-1733. Lee, A.J., Asher, W.B., Stern, H.A., Bren, K.L., Krauss, T. D. "Single-molecule analysis of cytochrome c folding by monitoring the lifetime of an attached fluorescent probe," J. Phys. Chem. Lett 2013, 4, 2727-2733. Han, Z., Qiu, F., Eisenberg, R., Holland, P.L., Krauss, T. D. "Robust Photogeneration of H2 in Water Using Semiconductor Nanocrystals and a Nickel Catalyst," Science 2012, 338, 1321-3124. Lee, A. J., Wang, X., Carlson, L. J., Smyder, J. A., Tu, X., Zheng, M., Krauss, T. D. "Bright Fluorescence from Individual Single-Walled Carbon Nanotubes," Nano Lett. 2011, 11, 1636-1640. Evans, C. M., Evans, M., Krauss, T. D. "Mysteries of TOPSe Revealed: Insights into Quantum Dot Nucleation," J. Am. Chem. Soc. 2010, 132, 10973-10975. Wang, S., Khafizov, M., Tu, X., Zheng, M., Krauss, T.D. "Multiple Exciton Generation in Single-Walled Carbon Nanotubes," Nano Lett. 2009, 10, 2381-2386. Evans, C. M., Guo, L., Peterson, J. J., Maccagnano, S., Krauss, T. D. "Ultra-bright PbSe Magic Sized Clusters," Nano Lett. 2008, 8, 2896-2899. Huang, L., Krauss, T. D. "Quantized bimolecular Auger recombination of excitons in single-walled carbon nanotubes," Phys. Rev. Lett. 2006, 96, 057407 . Peterson, J. J., Krauss, T. D. "Fluorescence Spectroscopy of Single Lead Sulfide Quantum Dots," Nano Lett. 2006, 6, 510-514. Hartschuh, A., Pedrosa, H. N., Novotny, L., Krauss, T. D. "Simultaneous Fluorescence and Raman Scattering from Individual Single-Walled Carbon Nanotubes," Science 2003, 301, 1354-1356. Du, H., Chen, C.L., Krishnan, R., Krauss, T.D., Harbold, J.M., Wise, F.W., Thomas, M.G., Silcox, J. "Optical properties of colloidal PbSe nanocrystals," Nano. Lett. 2002, 2, 1321-1326.