Assembly of Nanomaterials using Polymers and Biomaterials: Sensing and Electronic Applications
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Assembly of Nanomaterials using Polymers and Biomaterials: Sensing and Electronic Applications Jaebeom Lee†, Nicholas A. Kotov†, Alexander O. Govorov§ †
Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, 48109
§
Department of Physics and Astronomy, Ohio University, Athens, OH, 45701
Abstract The hybrid assembly of inorganic nanomaterials upon chemical and biological bonding has occupied attentions to yield manifold optical and electromagnetic properties. Nanomaterials that can be virtually conjugated with any other nanomaterials by ligand-receptor / antigen-antibody reactions, polymer tethering, and DNA hybridization are of importance for fundamental comprehension of electronic process in nano-scale regime as well as for development of advanced sensing and imaging devices. Semiconducting nanoparticles(NPs)/ nanowires(NWs) like CdTe that have compatibly narrow range of strong photoluminescence (PL) with broad range of absorbance band stand in the spotlight of imaging and sensing materials. Optical effects in noble metallic NPs such as Au and Ag have been worth noticing due to localized surface plasmons. These optical modes lead to highly localized electromagnetic fields outside the particles that take advantage of the development of novel system such as surface enhanced Raman spectroscopy (SERS) and highly compacted optoelectronic devices and sensors. In particular, it is known that metallic NPs has stronger plasmon field than the surface of bulky metals, leading to potent interactions to adjacent materials in secured conjugated superstructures that induce non-linear optical properties. In this report, we review on a novel biological / polymeric inspired hybrid superstructures between semiconducting CdTe nanowires and Au or Ag nanoparticles. This superstructure demonstrates remarkable optical effects i.e., PL en-hance ment of NWs, sensing application for temperature and solvents stemming from SERS-like collective i nteractions of NPs and NWs., and light harvest from Förster resonance energy tra-nsfer (FRET).
1. Introduction Nanomaterials superstructures are an important pathway to creation of smart materials with new functionalities because the deficiency of nanomaterial synthesis technology might delay more advanced application and single material that has different sizes and shapes might not be sufficient to be employed in various industrial applications. The complement among different materials and shapes of materials will induce highly effective application in nanomaterials module manufactures. Semiconducting NPs and NWs have been employed in the field of electronic, optical and biomedical sensors, bio-labeling and display devices industries.4-18 In particular, NWs that has the length of
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several micrometers with aspect ratios is 300 ~ 800 are becoming novel industrial materials for the realization of nanoscale electronic circuits using bottom-up technology to subjugate the limitation of current lithographic techniques.1,3,10,19-42 Semi
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