...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Examination of silver nanoparticle fabrication by pulsed-laser ablation of flakes in primary alcohols
【24h】

Examination of silver nanoparticle fabrication by pulsed-laser ablation of flakes in primary alcohols

机译：通过脉冲激光烧蚀伯醇中的薄片来检查银纳米颗粒的制备

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper describes the formation and subsequent behavior of silver nanoparticles (NPs) observed by optical spectra, atomic force microscopy, and transmission electron microscopy in primary alcohols by nanosecond pulsed-laser irradiation (1064 and 532 nm, typically at 1 J/(cm(2) pulse)) of silver flakes. Effects of the carbon chain length of the solvents and the irradiation atmosphere of the solutions on the Ag NP formation were investigated. The effect of alcohol chain length in aerated solutions can be described as follows: (1) in short-chain alcohols such as methanol and ethanol, the NPs are extremely unstable and easily settled down to form precipitates by centrifugation treatment; (2) very stable NPs are formed with an appreciably smaller particle size distribution in alcohols with chain lengths from C-3 to C-5 than in alcohols with longer chain length than C-5; (3) the yield of NPs is dependent on the alcohol chain length. On the other hand, the yield of NPs is greater in Ar- and N-2-saturated solutions than in aerated solutions. Additionally, the yield is similar regardless of the chain length, with smaller size distributions than those in air-equilibrated solutions. Oxygen molecules dissolved in the solvents are responsible for these observations. The oxygen effect consists of two Parts: (1) the scavenging of electrons generated by the plasma formation and thermionic emission due to extremely high temperature under the ablation condition; (2) the formation of an oxide layer on the surface of particles that hampers further growth processes to form NPs. Furthermore, we observed the formation of string segments in evacuated ethanol due to coagulation and coalescence of bare metal particles, giving rise to the splitting of the plasmon band. Thus we demonstrated that the systematic change in the solvent and irradiation atmosphere can control the particle size and size distribution. The present findings may add a new aspect to better manipulate NP fabrication based upon the laser ablation method.
机译：本文描述了通过纳秒脉冲激光辐照（1064和532 nm，通常在1 J /（cm（ 2）脉冲））的银薄片。研究了溶剂的碳链长度和溶液的辐照气氛对Ag NP形成的影响。充气溶液中醇链长的影响可描述如下：（1）在短链醇（如甲醇和乙醇）中，NPs非常不稳定，通过离心处理易于沉淀形成沉淀; （2）在链长为C-3至C-5的醇中，形成的非常稳定的NP的粒径分布要比在链长比C-5的醇中小得多。 （3）NP的产量取决于醇链的长度。另一方面，在Ar和N-2-饱和溶液中，NPs的产率要比在充气溶液中更高。另外，无论链长如何，收率都相似，尺寸分布比空气平衡溶液小。溶解在溶剂中的氧分子是造成这些现象的原因。氧的作用包括两个部分：（1）在烧蚀条件下，由于极高的温度而清除由等离子体形成和热电子发射产生的电子; （2）在颗粒表面形成氧化层，阻碍进一步的生长过程以形成NP。此外，我们观察到由于裸露的金属颗粒的凝结和聚结，在抽空的乙醇中形成了弦段，从而引起了等离激元带的分裂。因此，我们证明了溶剂和辐照气氛的系统变化可以控制粒径和粒径分布。目前的发现可能会增加一个新的方面，以基于激光烧蚀方法更好地控制NP制造。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号