Structure and Properties of CdS/Regenerated Cellulose Nanocomposites
Structure and Properties of CdS/Regenerated Cellulose Nanocomposites
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DOI：
10.1002/mame.200500146
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发表时间：
2005-10
影响因子：
3.9
通讯作者：
Dong Ruan;Qilin Huang;Lina Zhang
中科院分区：
文献类型：
--
作者：
Dong Ruan;Qilin Huang;Lina Zhang
总结：采用原位合成法制备了硫化镉（CdS）半导体纳米晶与再生纤维素（RC）复合的新型无机-有机杂化材料。将纤维素溶解在6重量%的水溶液中。NaOH/4重量%尿素/硫脲水溶液在低温下，然后加入氯化镉（CdCl 2），导致CdS纳米晶体成功地在原位生长的纤维素溶液。通过浇铸所得溶液获得含有均匀CdS纳米颗粒的纳米复合膜。采用X射线光电子能谱、广角X射线衍射、热重分析、动态力学分析、原子力显微镜、透射电镜、紫外-可见光谱和光致发光光谱等手段对材料的结构和光学性能进行了表征。实验结果表明，CdS纳米晶存在于复合膜中，纤维素基体为CdS颗粒的均匀生长提供了受限介质。CdS/RC复合材料的光致发光光谱显示出窄的发射，其在紫外范围内的吸光度高于不含CdS的纤维素膜。本工作提供了一种在NaOH/尿素水溶液中制备纤维素功能材料的简单方法。CdS/RC纳米复合材料的光致发光和CdS纳米晶分散在RC基体中的TEM图像。
Summary: Novel inorganic-organic hybrid materials composed of cadmium sulfide (CdS) semiconducting nanocrystals and regenerated cellulose (RC) were prepared by using in situ synthesizing method. Cellulose was dissolved in a 6 wt.-% NaOH/4 wt.-% urea/thiourea aqueous solution at low temperature followed by addition of cadmium chloride (CdCl2), resulting that the CdS nanocrystals were successfully grown in situ in the cellulose solution. Nanocomposite films containing homogeneous CdS nanoparticles were obtained by casting the resulting solution. Their structure and optical properties were characterized by X-ray photoelectron spectroscopy, wide-angle X-ray diffraction, thermogravimetry analysis, dynamic mechanical analysis, atomic force microscopy, transmittance electronic microscope, UV-vis spectroscopy, and photoluminescence spectroscopy. The experimental results confirmed that the CdS nanocrystalline existed in the composite films, and cellulose matrix provided a confined medium for CdS particle growth in uniform size. The CdS/RC composites showed narrow emission in photoluminescence spectra, and their optical absorbance in the UV range was higher than that of the cellulose film without CdS. This work provided a simple method to prepare cellulose functional materials in NaOH/urea aqueous solution. Photoluminescence of CdS/RC nanocomposites and TEM image of CdS nanocrystals dispersed in RC matrix.