【摘 要】
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Surface-enhanced Raman scattering(SERS)has received significant interests because of its capability in ultra-sensitive detection of chemicals and biochemicals for various applications.For the developm
【机 构】
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Department of Chemistry,University of South Dakota,Vermillion,SD 57069,USA
【出 处】
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2016年分析化学前沿国际研讨会及中美分析化学研讨会
论文部分内容阅读
Surface-enhanced Raman scattering(SERS)has received significant interests because of its capability in ultra-sensitive detection of chemicals and biochemicals for various applications.For the development of SERS-active nanomaterials,recently there are increasing attentions on the utilization of semiconductor nanomaterials as a new type of active SERS substrates.In this work,we will present our recent study on the preparation and manipulation of nanostructured cuprous oxide,as well as the evaluation and simulation of SERS activities of the final products.Specifically,we will first demonstrate that cuprous oxide nanostructures with hierarchical porosity,including individual polycrystalline nanoshells and porous thin films,can be used as SERS active substrates for enhancing Raman signals of adsorbed probe molecules.Together with FDTD simulation,we believe that the observed SERS activity of cuprous oxide nanomaterials can be interpreted as synergistic effects of strong chemical interactions,localized electromagnetic field enhancement,and hierarchical porosity of the nanostructures.Then we reported our discovery that micro-size cuprous oxide microcrystals can also demonstrate SERS activity in a process of chemical etching,during which the structure porosity was increased and SERS sensitivity was increasing accordingly.An even interesting result is the assembly of SERS-active cuprous oxide nanocrystals.Cubic shape cuprous oxide nanocrystals with a size around 50 nm can be self-assembled into supercrystals with a size of several micrometers.The SERS activity of such supercrystals was evaluated and our experimental results also showed that the formation of supercrystals can be essential in impacting the SERS performance.Overall,we introduced a possible application of cuprous oxide nanomaterials in the field of SERS detection.Considering the photocatalytic activity of the cuprous oxide,these SERS active nanomaterials might be very helpful in studying certain energy storage materials.
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