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中文摘要：
用硼氢化钠作还原剂,制备出两种相对稳定的含银纳米颗粒的水溶胶,用透射电镜（TEM）和光学吸收谱对这些颗粒进行了表征.当被还原的银离子较少时,所形成的银纳米颗粒较小,吸收峰呈现二极等离子体共振吸收峰.当被还原的银离子较多时,银纳米颗粒尺寸变大,并出现二极和四极共振吸收峰.在Ag纳米颗粒形成后,对其溶液稀释,发现其峰形保持不变,而峰位会出现红移,最大红移量可达到10 nm.透射电镜研究表明,低浓度溶胶中的Ag纳米颗粒尺寸较为均匀,平均直径12 nm.高浓度溶胶中的纳米颗粒尺寸呈双尺寸分布特点,少量颗粒直径小于14 nm,大部分颗粒直径大于20 nm.
英文摘要：
Two kinds of relatively steady colloids containing silver nanoparticles were prepared by Sol- Gel method using sodium tetrahydroborate as reducing agent. The samples were characterized by optical absorption spectra and transmission electron microscopy. UV-Visible absorption spectra show that the size of silver nanopaticles is small when the concentration of Ag^＋ was low and the absorption band was belonged to dipole resonance of nanoparticles. The size of nanoparticles became larger with the increase of the concentration of Ag^＋. The dipole and quadrupole oscillation contributed to the optical absorption spectra. It was also found that the shapes of the absorption bands kept their shapes when the colloids containing silver nanoparticles were diluted. However, the peaks of absorption were red-shifted with the biggest shift of 10 nm. TEM study showed that the size of Ag nanoparticles in low concentration colloid was uniform with average size of 12 nm. The Ag nanoparticles in high concentration colloid had a dual-mode size distvibution with little nanoparticles smaller than 14 nm and others larger than 20 nm.
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