Hydroxyl-functionalized polyaniline nanospheres: Tracing molecular interactions at the nanosurface via vitamin C sensing
Hydroxyl-functionalized polyaniline nanospheres: Tracing molecular interactions at the nanosurface via vitamin C sensing
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DOI：
10.1021/la801128j
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发表时间：
2008-09-02
期刊：
影响因子：
3.9
通讯作者：
Jayakannan, M.
中科院分区：
文献类型：
--
作者：
Anilkumar, P.;Jayakannan, M.
在这里，我们报告了一种新型的聚苯胺纳米球轴承单和双羟基官能团的合成，通过维生素C传感跟踪在纳米表面的分子相互作用。通过定制的方法合成了两种新的苯胺单体，并聚合制备了可溶性和均匀的聚苯胺纳米球。采用NMR、FT-IR、MS等技术对单体和聚合物的结构进行了表征，并采用SEM和TEM对纳米材料的形貌进行了分析。通过FT-IR和动态光散射技术分析了纳米材料形成的机理。这些研究表明，羟基官能化的单体在单体水平上具有强氢键，并在水中形成球形聚集体，其是尺寸为600 +/- 100 nm的聚苯胺纳米球的模板。控制合成也进行了使用苯胺盐酸盐作为未取代的对应物，这产生聚苯胺纳米纤维。WXRD分析证实了在羟基取代的纳米球中在2 θ = 7.3度（d-间距为13.4埃）的较低角度处存在尖锐峰，这与固态有序结晶域的增强有关，而未取代的纳米纤维被发现是高度无定形的。以维生素C为分析物，研究了纳米球表面功能化对生物分子传感能力的影响。发现双羟基官能化的聚苯胺纳米球显示出对维生素C的有效分子相互作用，而具有单羟基基团或未取代的纳米纤维的纳米球作为传感材料失败。在坚果壳中，在本研究中，我们第一次证明了聚苯胺纳米材料表面功能化的重要性，专门是纳米球，使用羟基研究纳米表面与生物分子如维生素C的分子相互作用。
Here, we report a synthesis of novel polyaniline nanospheres bearing mono- and bishydroxyl functional groups were to trace the molecular interactions at the nanosurfaces through vitamin C sensing. Two new aniline monomers synthesized via a tailor-made approach and polymerized to produce soluble and uniform polyaniline nanospheres. The structures of the monomers and polymers were characterized by NMR, FT-IR, and MS techniques, and the morphology of the nanomaterials was analyzed by SEM and TEM. The mechanistic aspects of the nanomaterial formations were analyzed by FT-IR and dynamic light scattering techniques. These studies revealed that the hydroxyl-functionalized monomers have strong hydrogen bonding at the monomer level and form spherical aggregates in water, which are templates for the polyaniline nanospheres 600 +/- 100 nm in size. A controlled synthesis was also carried out using aniline hydrochloride as an unsubstituted counterpart, which yields polyaniline nanofibers. WXRD analysis confirmed the presence of a sharp peak at lower angle at 2 theta = 7.3 degrees (d-spacing of 13.4 angstrom) in hydroxyl-substituted nanospheres with respect to enhancement of solid-state ordered crystalline domains, whereas unsubstituted nanofibers were found to be highly amorphous. Vitamin C was employed as an analyte to trace the molecular interaction at the nanosphere surface and Study the influence of nanosurface functionalization on the sensing ability of biomolecules. The bishydroxyl-functionalized polyaniline nanospheres were found to show efficient molecular interactions toward vitamin C, whereas nanospheres with a monohydroxyl group or unsubstituted nanofibers failed as sensing materials. In a nut shell, in the present investigation, for the first time, we have proved the importance of surface functionalization of polyaniline nanomaterial, exclusively nanospheres, using hydroxyl groups for studying the molecular interactions at the nanosurfaces with biomolecules such as vitamin C.