Abstract
Nanoimprinting enables the implementation of nanoparticle shapes with complex 2D shapes involving different materials. In addition to these objects, this article presents 3D-shaped nanoparticles fabricated by substrate conformal imprint technique. The imprint polymer AMONIL is used either in pure form or in combination with fluorescent dyes for the preparation of particles. The substrate conformal imprint lithography process, including etching and particle release, is conducted for both materials in a similar fashion. In this work, cuboidal particles with a high aspect ratio (1:120) are compared to particles with a T-shaped cross section with respect to their abilities to enhance or reduce their stiffness. Additionally, particles with a high aspect ratio are compared to particles with a lower aspect ratio (1:20). The local stiffness is found to depend strongly on the particle thickness and the geometry of their cross section. Thicker and 3D T-shaped particles present higher local stiffness than thinner and 2D cuboidal-shaped particles. The local bending angle was determined to be 77° for 2D-shaped particles and 83° for 3D-shaped particles, of the same total height of 176 nm. Very thin particles (<50 nm) of high aspect ratio prefer to curl finally forming loops.
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Acknowledgments
The authors acknowledge the technical assistance by Kerstin Fuchs, Florian Schnabel, Jens Krumpholz, Dietmar Gutermuth and Anita Dück. We also want to thank Moriz Beck-Broichsitter, Thomas Schmehl and Thomas Kissel of the University of Marburg for their inspiring discussions and material support in the case of fluorescent dyes and nanoimprint material. This work was supported by the “Zentrale Forschungsförderung” of the University of Kassel.
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This study was funded by the “Zentrale Forschungsförderung” of the University of Kassel.
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Reuter, S., Smolarczyk, M.A., Istock, A. et al. Bending properties of two- and three-dimensional-shaped nanoparticles fabricated via substrate conformal imprint lithography. J Nanopart Res 19, 184 (2017). https://doi.org/10.1007/s11051-017-3886-7
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DOI: https://doi.org/10.1007/s11051-017-3886-7