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Langmuir and Langmuir–Blodgett Films of Gold and Silver Nanoparticles
Langmuir ( IF 3.7 ) Pub Date : 2023-02-05 , DOI: 10.1021/acs.langmuir.2c02715 Michal Swierczewski 1 , Thomas Bürgi 1
Langmuir ( IF 3.7 ) Pub Date : 2023-02-05 , DOI: 10.1021/acs.langmuir.2c02715 Michal Swierczewski 1 , Thomas Bürgi 1
Affiliation
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Recently the focus of the Langmuir–Blodgett technique as a method of choice to transfer monolayers from the air/water interface onto solid substrates in a controllable fashion has been shifting toward purely hydrophobic gold and silver nanoparticles. The fundamental interactions between particles that become relevant in the absence of polar groups range from dispersive attractions from the metal cores and repulsions between ligand shells to weaker entropic factors. The layer evolution is explored, starting with interfacial self-assembly upon solution spreading and domain and circular island formation, which subsequently merge into a complete monolayer and finally form multilayers or macroscopic wrinkles. Moreover, structural properties such as the core:ligand size ratio are investigated in the context of dispersive forces, whereby the nanoparticles with small cores and long ligands tend not to aggregate sufficiently to produce continuous films, those with large cores and short ligands were found to aggregate irreversibly, and those in between the two extremes were concluded to be able to form highly organized crystalline films. Similarly, the characteristics of the spreading solution such as the concentration and the solvent type crucially influence the film crystallinity, with the deciding factor being the degree of affinity between the capping ligand and the solvent used for spreading. Finally, the most common strategies employed to enhance the mechanical stability of the metal nanoparticle films along with the recent attempts to functionalize the particles in attempts to improve their applicability in the industry are summarized and evaluated in relation to their future prospects. One of the objectives of this feature article is to elucidate the differences between hydrophobic metal nanoparticles and typical amphiphilic molecules that the majority of the literature in the field describes and to familiarize the reader with the knowledge required to design Langmuir–Blodgett nanoparticle systems as well as the strategies to improve existing ones.
中文翻译：
金银纳米粒子的 Langmuir 和 Langmuir-Blodgett 薄膜
最近，朗缪尔-布洛杰特技术作为一种以可控方式将单分子层从空气/水界面转移到固体基质上的方法，其焦点已转向纯疏水性金和银纳米颗粒。在没有极性基团的情况下相关的粒子之间的基本相互作用范围从金属核的色散吸引力和配体壳之间的排斥到较弱的熵因子。探索了层的演变，从溶液扩散时的界面自组装以及域和圆形岛的形成开始，随后合并成完整的单层，最后形成多层或宏观皱纹。此外，在分散力的背景下研究了结构特性，例如核：配体尺寸比，其中具有小核和长配体的纳米颗粒往往不能充分聚集以产生连续的薄膜，而那些具有大核和短配体的纳米颗粒被发现不可逆地聚集，并且介于两个极端之间的那些被认为能够形成高度组织的晶体薄膜。同样，铺展溶液的特性（例如浓度和溶剂类型）对薄膜的结晶度有至关重要的影响，其中决定因素是封端配体与铺展溶剂之间的亲和力程度。最后，总结和评估了用于增强金属纳米颗粒薄膜机械稳定性的最常见策略，以及最近对颗粒进行功能化以提高其在工业中的适用性的尝试，并对其未来前景进行了评估。 这篇专题文章的目的之一是阐明疏水性金属纳米粒子和该领域大多数文献描述的典型两亲性分子之间的差异，并使读者熟悉设计 Langmuir-Blodgett 纳米粒子系统以及改进现有策略的策略。
更新日期：2023-02-05
中文翻译：
金银纳米粒子的 Langmuir 和 Langmuir-Blodgett 薄膜
最近，朗缪尔-布洛杰特技术作为一种以可控方式将单分子层从空气/水界面转移到固体基质上的方法，其焦点已转向纯疏水性金和银纳米颗粒。在没有极性基团的情况下相关的粒子之间的基本相互作用范围从金属核的色散吸引力和配体壳之间的排斥到较弱的熵因子。探索了层的演变，从溶液扩散时的界面自组装以及域和圆形岛的形成开始，随后合并成完整的单层，最后形成多层或宏观皱纹。此外，在分散力的背景下研究了结构特性，例如核：配体尺寸比，其中具有小核和长配体的纳米颗粒往往不能充分聚集以产生连续的薄膜，而那些具有大核和短配体的纳米颗粒被发现不可逆地聚集，并且介于两个极端之间的那些被认为能够形成高度组织的晶体薄膜。同样，铺展溶液的特性（例如浓度和溶剂类型）对薄膜的结晶度有至关重要的影响，其中决定因素是封端配体与铺展溶剂之间的亲和力程度。最后，总结和评估了用于增强金属纳米颗粒薄膜机械稳定性的最常见策略，以及最近对颗粒进行功能化以提高其在工业中的适用性的尝试，并对其未来前景进行了评估。 这篇专题文章的目的之一是阐明疏水性金属纳米粒子和该领域大多数文献描述的典型两亲性分子之间的差异，并使读者熟悉设计 Langmuir-Blodgett 纳米粒子系统以及改进现有策略的策略。
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