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More On Research | More On Teaching | More On Personal | JPC Editorial Office | Conferences of Interest RESEARCH INTERESTS: Experimental Physical Chemistry, Materials Chemistry, Novel Semiconductor, Metal, and Metal Oxide Nanomaterials, Interfaces and Nanoscience, Solar Energy Conversion, Hydrogen Generation and Storage, Cancer Biomarker Detection Using Nanotechnology, Femtosecond Laser and Optical Spectroscopy The Zhang research group is primarily interested in the design, development, characterization, and application of advanced materials with emphasis on optical and electronic nanomaterials of both semiconductors, metal oxides, and metals. These nanomaterials have novel physical and chemical properties due to quantum confinement and exceedingly large surface to volume ratio. The design and synthesis of the materials are mostly based on inorganic colloidal chemistry methods. The synthesized materials are characterized systematically and extensively using a variety of experimental techniques including optical spectroscopy (UV-visible, fluorescence, IR, and Raman), femtosecond laser spectroscopy (for probing ultrafast charge carrier dynamics), x-ray (XAFS, XRD, x-ray photoemission), electrochemical, and microscopy (HRTEM, SEM, AFM). In the meantime, we explore emerging technological applications of these advanced nanomaterials in areas such as solar energy conversion, hydrogen generation and storage, photocatalysis, photovoltaics, photoelectrochemistry, sensors and imaging (particularly based on SERS), detection of cancer biomarkers, solid state lighting, and lasers. At the fundamental level, we hope to elucidate, with molecular details, key factors, such as particle size, shape, crystal structure, interface, and environment, that influence the properties and functionalities of the nanomaterials. Femtosecond laser spectroscopy is used to directly probe of charge carrier or exciton dynamics on the ultrafast time scale. X-ray and high resolution microscopy allows for detailed structural studies. Optical and electronic properties are studied using optical spectroscopy and electrochemical measurements. One of our objectives is to establish relationship between the structure of the materials and their properties functionalities. At the technological level, we explore emerging applications of these novel materials in a number of areas including sensors, solar cells, hydrogen generation and storage, catalysis, detectors, imaging, solid state lighting, and lasers. Examples of nanomaterials systems that have been studied and/or are currently under investigation include: CdS, CdSe, CdTe, ZnS:Mn, ZnSe:Mn, ZnSe:Cu, ZnSe:Ag, AgI, AgBr, TiO2, ZnO, WO3, CuS, PbI2, PbS, Fe2O3, BiI3, Ag2S, Si, Ag, Pt, Pd, and Au. For a list of publications, please see "More On Research". In addition to nanomaterials, the Zhang group is interested in photodrugs such as hematoporphyrin derivative, chlorins, and phthalocyanines that have been studied for possible application in photodynamic therapy (PDT). PDT is a novel medical technology for treatment of cancer tumors. PDT activity begins when the drug is exposed to light, which activates the drug and causes tumor destruction. PDT is selective and localized, and has less side effects compared to chemotherapy. Since the excited states of sensitizers are directly involved in the photoreaction process, a study of their excited state reaction mechanism is essential for achieving a good understanding of their function. This will help to accelerate the development of new and more efficient photodrugs. We are also interested in the study of interaction between photodrugs and protein as well as DNA molecules.SELECTED PUBLICATIONS Please see "More On Research"
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