银二聚体型空穴-电子转换器的增感技术研究
文献类型：学位论文
| 作者 | 史瑶 |
| 学位类别 | 博士 |
| 答辩日期 | 2004 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 中国科学院声学研究所 |
| 关键词 | 澳化银核壳乳剂 Ag2还原增感 表面化学增感 协同增感 |
| 其他题名 | The Study on the Sensitization of Silver Dimer as a Hole-electron Converter |
| 中文摘要 | 通过还原剂，利用掺杂和包壳的技术将Ag2掺杂至澳化银乳剂颗粒内部，制备了一系列掺杂不同量Ag2的立方体澳化银核壳乳剂，考察了内部还原掺杂Ag：对乳剂感光度的影响，结果显示内部掺杂Ag2可以提高乳剂的感光度，但随着还原剂量的增加，颗粒表面的Ag2量也逐渐增大，乳剂灰雾增大。对内部Ag2掺杂的核壳乳剂进行了表面S、Au，S+Au增感后发现，乳剂内部掺杂Ag2后与硫增感可以实现协同增感效果；与金增感一同使用时，在还原剂量适宜的条件下，可以达到协同增感的作用，但在还原剂量大的情况下，两者不能共同使用，会引发强烈的灰雾。同样由于金增感的原因，内部还原掺杂Ag2的乳剂也只能在合适的还原剂及S、Au增感剂用量下，才能有内部还原增感与表面S＋Au增感的协同作用。对Ag2掺杂的乳剂进行了光谱增感，结果表明，光谱增感后，内部还原掺杂Ag2的乳剂同样有增感效果，并且我们根据光谱增感的结果推测，光谱增感中曝光产生的空穴不是固定在晶体表面不动的，而是可以向内部扩散的。加快还原增感后核乳剂的包壳速率可以在一定程度上降低乳剂的灰雾，但仍不能完全将生成的Ag2保持在晶体的内部，不扩散到表面。采用在核壳乳剂中加入适当氧化剂的方法可以破坏被排斥到晶体表面的Ag2，使其不能和表面化学增感，尤其是金增感和硫加金增感，相互作用，从而降低了乳剂灰雾。本研究表明，嗅化银颗粒的内部经Ag2还原掺杂后，只要控制好适当的条件，可以与表面化学增感共同实现协同增感作用，使乳剂的感光度提高到一个新的高度。 |
| 英文摘要 | A series of cubic AgBr core-shell emulsions were prepared from the core emulsions reduced by DMAB and shelled by AgBr. These core-shell emulsions doped with Ag2 in the interior of grains exhibited a significant increase in sensitivity. The fog was slightly increased, however, with increasing the amount of DMAB added to the core emulsions. After these emulsions were sensitized respectively by sulfur, gold or sulfur-plus-gold on the surface of grains, the relative sensitivities of the emulsions were much higher than that to the controlled one without Ag2 in the interior of grains, i.e. [DMAB]=0. It was shown there existed a cooperative sensitization in the AgBr core-shell emulsions sensitized by internal reduction and surface chemical sensitization. On the other hand, the fog densities of these chemically sensitized emulsions rose rapidly with the amount of DMAB added in preparation of core emulsions, particularly in the cases of emulsions with S+Au and Au sensitization. It was considered to be related to Ag2 on the surface of grains, which were expelled from the core to the surface in the shelling process. Spectral sensitization was also carried out for these emulsions. The results showed that the sensitivities of all emulsions with the Ag2 doped were significantly higher than that of controlled one without the Ag2 doped when the emulsions were sensitized by the green-sensitive dye and exposed to green light. It might imply that the positive holes generated from the sensitizing dye adsorbed on the surface of grains by the green light were able to move toward the interior of grains, rather than fixed at the dye, so that they could be trapped by the internal Ag2 to increase the sensitivity. In addition, it was evident that an increase in the shelling rate of core emulsion was more favorable to depress the fog because it could include more Ag2 centers inside. It was also quite effective for a proper oxidizer to oxidize Ag2 centers on the surface of crystals for depressing the emulsion fog. In conclusion, the results of this paper showed that the cooperative sensitization by the internal reduction sensitization and the surface chemical sensitization for the AgBr grains was could be realized under proper conditions, as a result it makes the increase in sensitivity of emulsions possible. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 48 |
| 源URL | [http://159.226.59.140/handle/311008/850]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 史瑶. 银二聚体型空穴-电子转换器的增感技术研究[D]. 中国科学院声学研究所. 中国科学院声学研究所. 2004. |
入库方式： OAI收割
来源：声学研究所
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