High resolution patterning of nanoparticles by evaporative self-assembly enabled by in situ creation and mechanical lift-off of a polymer template

Abstract

High-resolution patterning of nanostructured materials into open templates is limited by the processes of creation and removal of the necessary template. In this work, a process for forming a micropatterned template from cellulose acetate polymer in situ on the substrate is demonstrated. Nanoparticles are patterned by evaporative self-assembly, and the template is removed by mechanical means. The process is demonstrated by patterning zinc oxide nanoparticles on silicon and cyclic olefin copolymer substrates and by creating a highly sensitive ultraviolet light detector.

Numerical simulation of the impact and deposition of charged particulate droplets

“…The approach developed provides a fast computational tool to analyze particulate cluster-droplets. Recently, the author has started a collaboration (see Choi et al [3][4][5] and Demko et al [8]) with an experimental team at UC Berkeley, and the use of the numerical tool to guide the experiments is currently underway The numerical approach and model can be used on virtually any type (shape) of cluster-droplet domain. Since the results are derived from a direct numerical simulation, one can also post-process other more detailed statistical information.…”

“…is the kurtosis (fourth moment), which measures the ''tightness'' of the distribution. 8 This is straightforward to implement, and can provide much more detailed information on post-impact cluster-droplet characteristics.…”

“…There are a large variety of industrial deposition techniques, and we refer the reader to the surveys of the state of the art found in Martin [31,32]. Beyond the previously mentioned applications, there are a variety of other areas where cluster of particulates arise, such as small-scale manufacturing processes (see, for example, Luo and Dornfeld [27][28][29][30], Arbelaez et al [1,2], Ciampini et al [6,7], GomesFerreira et al [20], Ghobeity et al [16,17], Choi et al [3][4][5] and Demko et al [8]). Improper handling of these clusters can lead to manufacturing inconsistencies/variability which can strongly affect the overall product quality, in particular if the manufactured devices have small dimensions.…”

On the thermal response of a surface deposited laser-irradiated powder particle

“…Applications include, for example, optical coatings and photonics (Nakanishi et al [2]), MEMS applications (Fuller et al [3], Samarasinghe et al [4] and Gamota et al [5]) and Biomedical devices (Ahmad et al [6]). In terms of processing techniques, we refer the reader to Sirringhaus et al [7], Wang et al [8], Huang et al [9], Choi et al [10][11][12][13] and Demko et al [14,15] for details. Thus, in order for emerging additive approaches to succeed, one must draw upon rigorous theory and computation to guide and simultaneously develop design rules for upscaling to industrial manufacturing levels.…”

Rapid Computation of Statistically Stable Particle/Feature Ratios for Consistent Substrate Stresses in Printed Flexible Electronics

“…For an early history of the printed electronics field, see Gamota et al [1], Applications include, for example, optical coatings and photonics [2], MEMS applications [3,4], and biomedical devices [5]. There have been many proposed processing techniques, and we refer the reader to Sirringhaus et al [6], Wang et al [7], Huang et al [8], Choi et al [9][10][11][12], Demko et al [13,14], and Fathi et al [15] for details.…”