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首页> 外文期刊>ACS applied materials & interfaces >Graphene Oxide-Based Hydrogels to Make Metal Nanopartide-Containing Reduced Graphene Oxide-Based Functional Hybrid Hydrogels
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Graphene Oxide-Based Hydrogels to Make Metal Nanopartide-Containing Reduced Graphene Oxide-Based Functional Hybrid Hydrogels

机译：氧化石墨烯基水凝胶制备含金属纳米粒子的还原型氧化石墨烯基功能杂化水凝胶

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In this study, stable supramolecular hydrogels have been obtained from the assembly of graphene oxide (GO) in presence of polyamines including tris(aminoethyl) amine, spermine, and spermidine [biologically active molecule]. One of these hydrogels has been well characterized by various techniques including field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD) study, and Raman spectroscopy, TEM and AFM stuthes of one of these hydrogels have revealed the presence of a network structure of cross-linked nanosheets. This suggests the supramolecular assembly of GO in the presence of polyamines using the acid—base type electrostatic interaction. In presence of a mild reducing agent (vitamin C), one of these GO hydrogels has been transformed into a reduced graphene oxide (RGO)-based hydrogel by a simple in situ reduction of GO sheets within the hydrogel matrix. Moreover, noble metal nanoparticle containing RGO based hybrid hydrogels have been obtained using in situ and simultaneous co-reduction of GO and noble metal precursors within the GO gel matrix. The elegance of this method is in situ, "green chemical" and simultaneous reduction of GO and metal salts within the hydrogel matrix to form RGO-based hybrid gel and concomitant stabilization of metal nanoparticles (MNPs) within the gel system. The nascently formed MNPs are homogeneously and uniformly distributed on the surface of the RGO nanosheets within the hybrid gel. Interestingly, this MNP containing RGO-based hybrid hydrogel matrix acts as a potential catalyst for the reduction of aromatic nitro to amino group. The catalyst (hybrid gel matrix) can be separated easily after the reaction and reused several times.
机译：在这项研究中，稳定的超分子水凝胶是在多胺（包括三（氨基乙基）胺，亚精胺和亚精胺[生物活性分子]）存在下，从氧化石墨烯（GO）的组装物中获得的。这些水凝胶之一已通过多种技术进行了很好的表征，包括场发射扫描电子显微镜（FE-SEM），透射电子显微镜（TEM），原子力显微镜（AFM），X射线衍射（XRD）研究和拉曼光谱学这些水凝胶之一的TEM，AFM和Auth已表明存在交联的纳米片的网络结构。这表明在多胺存在下，GO的超分子组装是使用酸碱型静电相互作用的。在温和的还原剂（维生素C）存在下，这些GO水凝胶之一已通过在水凝胶基质中简单地就地还原GO片而转变为基于氧化石墨烯（RGO）的还原水凝胶。此外，使用GO凝胶基质内的GO和贵金属前体原位同时同时还原，已经获得了包含RGO基杂化水凝胶的贵金属纳米颗粒。这种方法的优雅之处在于原位“绿色化学”，同时还原水凝胶基质中的GO和金属盐以形成基于RGO的混合凝胶，并伴随着凝胶体系中金属纳米颗粒（MNP）的稳定化。刚形成的MNP均匀且均匀地分布在杂化凝胶内的RGO纳米片的表面上。有趣的是，这种含MNP的基于RGO的杂化水凝胶基质可作为将芳香族硝基还原为氨基的潜在催化剂。反应后，催化剂（混合凝胶基质）可以轻松分离，并可以重复使用多次。

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