Alipour Azita, Lakouraj Moslem Mansour, Roudbari Mohsen Najafi, Chaichi Javad
Polymer Laboratory, Organic Chemistry Department, Faculty of Chemistry, University of Mazanadaran P. O. Box 47416 Babolsar Iran
Analytical Chemistry Department, Faculty of Chemistry, University of Mazandaran P. O. Box 47416 Babolsar Iran.
RSC Adv. 2019 Feb 28;9(12):6907-6918. doi: 10.1039/c8ra10204j. eCollection 2019 Feb 22.
Novel hybrid nanocomposites based on polyaniline (PANi), hydrolyzed pectin (HPEc) and CdS nanoparticles (NPs) as electrochemiluminescent biomaterials were prepared. The samples were fabricated heterogeneous chemical polymerization and studied by FTIR, XRD, SEM, EDX, UV/Vis, TGA and DMTA analyses. The CdS@HPEc--PANi nanocomposite was produced coprecipitation of CdS NPs by direct addition of aqueous cadmium nitrate and sodium sulfide solutions into the polymerization system containing PANi and HPEc. The mCdS@HPEc--PANi nanocomposite was synthesized a new two-step surface modification strategy. The as-prepared CdS NPs synthesized the chemical precipitation method were modified with epichlorohydrin as an organic reagent to obtain modified CdS (mCdS) and subsequently modified with HPEc and polymerized with aniline hydrochloride to produce mCdS@HPEc--PANi. The more smooth morphology of the mCdS@HPEc--PANi relative to the CdS@HPEc--PANi was approved by the SEM images. The cyclic voltammetry and electrochemical impedance spectroscopy analyses were performed on the samples to evaluate electrochemical properties and the results have indicated the reinforcing effect of the nanoparticles on the electrochemical properties of the nanocomposites. The electrical conductivity measurements by the four probe method have shown a significant increase of electrical conductivity in the presence of the CdS-nanoparticles. The CL experiments confirmed the chemiluminescence effect in the nanocomposites and also higher luminescence intensity for mCdS@HPEc--PANi relative to the CdS@HPEc--PANi nanocomposite owing to better dispersion of CdS NPs in the former sample.
制备了基于聚苯胺（PANi）、水解果胶（HPEc）和硫化镉纳米颗粒（NPs）的新型杂化纳米复合材料作为电化学发光生物材料。通过非均相化学聚合制备样品，并通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱分析（EDX）、紫外可见光谱（UV/Vis）、热重分析（TGA）和动态热机械分析（DMTA）进行研究。通过将硝酸镉水溶液和硫化钠溶液直接加入含有PANi和HPEc的聚合体系中，共沉淀法制备了CdS@HPEc--PANi纳米复合材料。通过一种新的两步表面改性策略合成了mCdS@HPEc--PANi纳米复合材料。用环氧氯丙烷作为有机试剂对通过化学沉淀法合成的硫化镉纳米颗粒进行改性，得到改性硫化镉（mCdS），随后用HPEc进行改性，并与盐酸苯胺聚合，制备出mCdS@HPEc--PANi。扫描电子显微镜图像证实，相对于CdS@HPEc--PANi，mCdS@HPEc--PANi的形态更加光滑。对样品进行循环伏安法和电化学阻抗谱分析以评估其电化学性能，结果表明纳米颗粒对纳米复合材料的电化学性能具有增强作用。通过四探针法测量电导率表明，在存在硫化镉纳米颗粒的情况下，电导率显著增加。化学发光实验证实了纳米复合材料中的化学发光效应，并且由于硫化镉纳米颗粒在前一个样品中分散性更好，相对于CdS@HPEc--PANi纳米复合材料，mCdS@HPEc--PANi具有更高的发光强度。
