中文摘要：

以NaClO2为主要氧化剂，使用氧化漂白桉木浆制备C-6位羧基含量为0．8mmol／g的TEMPO氧化纤维素，然后将其剪切为纳米纤维素（NCC）。再以NCC为基材，以无水氯化镉及硫化钠为前驱体，用声化学法制备了NCC／CdS纳米复合光电材料。用X射线衍射（XRD）、场发射扫描电镜（SEM）、傅里叶红外光谱仪（FT-IR）以及光电化学实验对复合材料的结构及性能进行表征。结果表明，大量CdS纳米粒子复合在NCC基材上形成NCC／CdS纳米复合材料，CdS晶粒为立方型晶体，大小为7.3nm。用NCC／CdS纳米复合材料形成的薄膜器件在可见光区域的透光率高达60％。这种复合材料可产生1．35弘A的光电流，其光电转换效率为微晶纤维素／CdS复合材料的6倍。

英文摘要：

Oxidized celluloses with carboxylate content of 0.8mmol/g on C-6 position were prepared by oxidizing the bleached eucalyptus pulp with 2, 2, 6, 6-tetramethylpiperidinyl-1-oxyl （TEMPO） and NaCIO in water at 60 ℃ and pH 6.8, with NaCIO2 as the primary oxidant and then sheared into nanocrystalline cellulose （NCC） via ultra-high pressure homogenizer. Using cadmium chloride and sodium sulfide as precursors and NCC as substrate material, NCC/CdS opto-electrical nano-composites were successfully synthesized by a sonochemical method. The structure and properties were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, Fourier transformed infrared （FT-IR） and photoelectric experiments. Results show that a lot of nano-CdS particles are evenly compounded with the NCC and its crystal size is about 7.3nm according to XRD. A film with high transmittance of more than 60% in visible light region was prepared from the NCC/CdS nano-composites. The photocurrent of NCC/ CdS nano-composites is 13.5 hA, which is 6 times of the microcrystalline cellulose （MCC）/CdS nanocomposites.