Graphene Oxide-Based Hydrogels to Make Metal Nanoparticle-Containing Reduced Graphene Oxide-Based Functional Hybrid Hydrogels
Graphene Oxide-Based Hydrogels to Make Metal Nanoparticle-Containing Reduced Graphene Oxide-Based Functional Hybrid Hydrogels
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DOI：
10.1021/am301373n
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发表时间：
2012-10-01
影响因子：
9.5
通讯作者：
Banerjee, Arindam
中科院分区：
文献类型：
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作者：
Adhikari, Bimalendu;Biswas, Abhijit;Banerjee, Arindam
在这项研究中，稳定的超分子水凝胶已获得的组装氧化石墨烯（GO）的存在下，多胺，包括三（氨乙基）胺，精胺，亚精胺[生物活性分子]。这些水凝胶之一已经通过各种技术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）研究和拉曼光谱进行了很好的表征。这些水凝胶之一的TEM和AFM研究揭示了交联纳米片的网络结构的存在。这表明GO在多胺存在下使用酸碱型静电相互作用的超分子组装。在温和还原剂（维生素C）的存在下，这些GO水凝胶中的一种已经通过水凝胶基质内的GO片的简单原位还原而转化为还原的氧化石墨烯（RGO）基水凝胶。此外，已经使用GO凝胶基质内的GO和贵金属前体的原位和同时共还原获得了含有贵金属纳米颗粒的RGO基混合水凝胶。该方法的优点在于原位、“绿色化学”和同时还原水凝胶基质内的GO和金属盐以形成基于RGO的混合凝胶和伴随的凝胶体系内的金属纳米颗粒（MNP）的稳定化。初始形成的MNP均匀且均匀地分布在混合凝胶内的RGO纳米片的表面上。有趣的是，这种含有MNP的基于RGO的杂化水凝胶基质充当用于将芳族硝基还原成氨基的潜在催化剂。该催化剂（杂化凝胶基质）在反应后可以容易地分离并重复使用几次。
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 studies 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.