3D printing and pyrolysis of optical ZrO$_2$ nNanostructures by two-photon lithography: reduced shrinkage and crystallization mediated by nanoparticles seeds
Résumé
Two-photon lithography is a potential route to produce high-resolution 3D ceramics. However, the large shrinkage due to the elimination of an impor-tant organic counterpart of the printed material during debinding/sintering remains a lock to further development of this technology. To limit this phenomenon, an original approach based on a composite resin incorporating 45 wt% ultrasmall (5 nm) zirconia stabilized nanoparticles into the zirconium acrylate precursor is proposed to process 3D zirconia microlattices and nano-structured optical surfaces. Interestingly, the nanoparticles are used both as seeds allowing control of the crystallographic phase formed during the calcination process and as structural stabilizing agent preventing important shrinkage of the printed ceramic. After 3D photolithography and pyrolysis, the weight and volume loss of the microstructures are drastically reduced as compared to similar systems processed with the reference resin without nanoparticles, and stable 3D microstructures of cubic zirconia are obtained with high spatial resolution. In the case of a patterned surface, the refractive index of 2.1 leads to a diffraction efficiency large enough to obtain microfo-cusing with linewidths of 0.1 μm, and the demonstration of a microlens array with a period as small as 0.8 μm
Domaines
Matériaux
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Small - 2021 - Desponds - 3D Printing and Pyrolysis of Optical ZrO2 Nanostructures by Two%u2010Photon Lithography Reduced.pdf (3.89 Mo)
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