Schüler, Thomas and Steinbrück, Andrea and Festag, Grit and Möller, Robert and Fritzsche, Wolfgang (2009) Enzyme-induced growth of silver nanoparticles studied on single particle level. Journal of Nanoparticle Research, 11 (4). pp. 939-946.
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Based on their interesting properties, metal nanoparticles show the potential as an analytical tool in electronic (Burmeister etÂ al. 2004), optical (Yguerabide and Yguerabide 1998), and catalytic applications (Liu 2006). Their characteristics depend on the composition, shape, and size of the single particles. These various properties are utilized in many different approaches such as optics, magnetics (Lang etÂ al. 2007), and laser technology (Csaki etÂ al. 2007). We investigated an alternative method for the synthesis of nanoparticles. In this case, an enzyme, horseradish peroxidase, induces a silver deposition and replaces a metal nanoparticle as the reaction seed. Depending on the reaction time, we could obtain particles in a range of few nanometers up to more than 250Â nm. For a better understanding of the enzymatic silver deposition process, the silver particles produced by this process were analyzed by SEM, TEM, and atomic force microscopy (AFM) on a single particle level after different enhancement times. The AFM images were utilized for the characterization of particle height and volume to study the enzyme kinetics, i.e., the particle growth process. Thereby, two different phases are described: a first growth phase probably induced by the enzyme-related growth, and a second, more unspecific growth based on the metal deposition onto the silver deposits. These findings may help to use the enzyme-induced silver deposition in a quantitative manner for bioanalytical applications.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||08 May 2009 06:17|
|Last Modified:||08 May 2009 09:53|
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