A facile synthesis-fabrication strategy for integration of catalytically active viral-palladium nanostructures into polymeric hydrogel microparticles via replica molding.
A facile synthesis-fabrication strategy for integration of catalytically active viral-palladium nanostructures into polymeric hydrogel microparticles via replica molding.
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DOI：
10.1021/nn4005582
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发表时间：
2013-05
期刊：
影响因子：
17.1
通讯作者：
Cuixian Yang;Chang‐Hyung Choi;Chang-Soo Lee;H. Yi
中科院分区：
文献类型：
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作者：
Cuixian Yang;Chang‐Hyung Choi;Chang-Soo Lee;H. Yi
在温和条件下以可预测和受控的方式合成小的、均匀的、分散良好的和活性的Pd纳米催化剂是一个未满足的挑战。病毒纳米材料由于其明确的单分散结构以及丰富的表面功能沿着而成为控制纳米颗粒合成的有吸引力的生物模板。在这里，我们证明了自发形成的小（1-2 nm），均匀和高度结晶的钯（Pd）纳米粒子沿着转基因烟草花叶病毒（TMV 1cys）的生物模板没有外部还原剂。TMV和Pd前体之间的比例在沿着TMV生物模板沿着形成良好分散的Pd纳米颗粒中起着重要作用。然后通过复制模塑（RM）技术以简单、稳健和高度可再现的方式将所制备的Pd-TMV复合物整合到基于聚（乙二醇）（PEG）的微粒中。以重铬酸盐还原为模型反应，进一步证明了杂化Pd-TMV-PEG微粒的高催化活性、可回收性和稳定性。综上所述，这些发现表明了一个重要的步骤，简单，强大的，可扩展的合成和制造的有效的生物模板支持的Pd纳米催化剂在易于部署的聚合物支架具有高容量的控制方式。
The synthesis of small, uniform, well-dispersed and active Pd nanocatalysts under mild conditions in a predictable and controlled manner is an unmet challenge. Viral nanomaterials are attractive biotemplates for the controlled synthesis of nanoparticles due to their well-defined and monodisperse structure along with abundant surface functionalities. Here, we demonstrate spontaneous formation of small (1-2 nm), uniform and highly crystalline palladium (Pd) nanoparticles along genetically modified tobacco mosaic virus (TMV1cys) biotemplates without external reducing agents. The ratio between TMV and Pd precursor plays an important role in the exclusive formation of well-dispersed Pd nanoparticles along TMV biotemplates. The as-prepared Pd-TMV complexes are then integrated into the poly(ethylene glycol) (PEG)-based microparticles via replica molding (RM) technique in a simple, robust and highly reproducible manner. High catalytic activity, recyclability and stability of the hybrid Pd-TMV-PEG microparticles are further demonstrated through dichromate reduction as a model reaction. Taken together, these findings demonstrate a significant step toward simple, robust, and scalable synthesis and fabrication of efficient biotemplate-supported Pd nanocatalysts in readily deployable polymeric scaffolds with high capacity in a controlled manner.