PHOTOCHEMISTRY OF COLLOIDAL SEMICONDUCTORS .20. SURFACE MODIFICATION AND STABILITY OF STRONG LUMINESCING CDS PARTICLES
PHOTOCHEMISTRY OF COLLOIDAL SEMICONDUCTORS .20. SURFACE MODIFICATION AND STABILITY OF STRONG LUMINESCING CDS PARTICLES
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DOI：
10.1021/ja00253a015
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发表时间：
1987-09-16
影响因子：
15
通讯作者：
HENGLEIN, A
中科院分区：
文献类型：
--
作者：
SPANHEL, L;HAASE, M;HENGLEIN, A
本文介绍了平均粒径在40 ~ 60 μ m之间、粒径分布较窄的CdS溶胶的制备。胶体可分离为固体，固体又可再溶解成约10~（12）M的溶液。由氢氧化镉沉淀物的颗粒的活化产生荧光的量子产率超过50%的样品。蓝色或绿色荧光发生在带隙能量附近，这取决于颗粒的尺寸。还制备了激活的ZnS-CdS共胶体的紫色荧光样品。光阳极腐蚀测试表明，活化的CdS胶体比未活化的胶体稳定2000倍。在激光照射下，颗粒变得稍大，这归因于由于局部加热而加速的奥斯特瓦尔德熟化。极强的激光将颗粒分解为Cd+ S。
The preparation of CdS sols with a mean diameter between 40 and 60 Á and a relatively narrow size distribution is described. The colloids could be separated as solids, which in turn could be redissolved to give solutions of some 10~ 1 2 M. Activation of the particles by a cadmium hydroxide precipitate yielded fluorescing samples with a quantum yield exceeding 50%. The blue or green fluorescence occurred close to the band gap energy, which depended on the size of the particles. Violet fluorescing samples of activated ZnS-CdS co-colloids were also prepared. Photoanodic corrosion measurements showed that the activated CdS colloid was 2000 times more stable than the nonactivated one. Under laser illumination the particles became a little larger which is ascribed to an acceleration of Ostwald ripening due to local heating. Extremely intenselaser light decomposed the particles into Cd+ S.