Mills Sara C, Starr Natalie E, Bohannon Nicholas J, Andrew Jennifer S
Department of Materials Science and Engineering, University of Florida, Gainesville, FL, United States.
Front Chem. 2021 Jun 17;9:703528. doi: 10.3389/fchem.2021.703528. eCollection 2021.
Incorporating nanoparticles into devices for a wide range of applications often requires the formation of thick films, which is particularly necessary for improving magnetic power storage, microwave properties, and sensor performance. One approach to assembling nanoparticles into films is the use of electrophoretic deposition (EPD). This work seeks to develop methods to increase film thickness and stability in EPD by increasing film-substrate interactions functionalizing conductive substrates with various chelating agents. Here, we deposited iron oxide nanoparticles onto conductive substrates functionalized with three chelating agents with different functional moieties and differing chelating strengths. We show that increasing chelating strength can increase film-substrate interactions, resulting in thicker films when compared to traditional EPD. Results will also be presented on how the chelating strength relates to film formation as a function of deposition conditions. Yield for EPD is influenced by deposition conditions including applied electric field, particle concentration, and deposition time. This work shows that the functionalization of substrates with chelating agents that coordinate strongly with nanoparticles (phosphonic acid and dopamine) overcome parameters that traditionally hinder the deposition of thicker and more stable films, such as applied electric field and high particle concentration. We show that functionalizing substrates with chelating agents is a promising method to fabricate thick, stable films of nanoparticles deposited EPD over a larger processing space by increasing film-substrate interactions.
将纳米颗粒整合到用于广泛应用的器件中通常需要形成厚膜，这对于提高磁储能、微波性能和传感器性能尤为必要。将纳米颗粒组装成膜的一种方法是使用电泳沉积（EPD）。这项工作旨在通过增加膜与基底的相互作用，即使用各种螯合剂对导电基底进行功能化，来开发增加EPD中膜厚度和稳定性的方法。在这里，我们将氧化铁纳米颗粒沉积到用三种具有不同功能基团和不同螯合强度的螯合剂功能化的导电基底上。我们表明，增加螯合强度可以增加膜与基底的相互作用，与传统的EPD相比，能形成更厚的膜。还将展示螯合强度与作为沉积条件函数的成膜之间的关系。EPD的产率受包括施加电场、颗粒浓度和沉积时间在内的沉积条件影响。这项工作表明，用与纳米颗粒强烈配位的螯合剂（膦酸和多巴胺）对基底进行功能化，克服了传统上阻碍沉积更厚、更稳定膜的参数，如施加电场和高颗粒浓度。我们表明，用螯合剂对基底进行功能化是一种很有前途的方法，通过增加膜与基底的相互作用，在更大的加工空间内制造通过EPD沉积的厚而稳定的纳米颗粒膜。
