The controlled shaping of nanoparticles' morphology is one of the pillars of nanotechnology. Here, we demonstrate that photocatalytic lithography, a technique already proved to be useful in materials science, can act as a dry etching technique for noble metal nanoparticles. Triangular silver nanoprisms are self-assembled on titanium dioxide films and photocatalytically shaped into discoidal particles upon irradiation with near-UV light. The obtained patterned surfaces show a dramatically different surface-enhanced Raman scattering response, suggesting the utility of our approach for the development of sensors. The photocatalytic nature of the particle shaping is demonstrated and a plausible mechanism drawn by performing photocatalysis in different configurations (direct and remote) and by irradiating in different solvents.
Sculpturing patterns of plasmonic silver nanoprisms by means of photocatalytic lithography / G. Panzarasa, G. Soliveri, G.L. Marra, L. Meda, A. Savoini, S. Ardizzone, M. Salvalaggio. - In: NANOTECHNOLOGY. - ISSN 0957-4484. - 28:5(2017), pp. 155302.1-155302.7. [10.1088/1361-6528/aa631b]
Sculpturing patterns of plasmonic silver nanoprisms by means of photocatalytic lithography
G. SoliveriSecondo
;S. ArdizzonePenultimo
;
2017
Abstract
The controlled shaping of nanoparticles' morphology is one of the pillars of nanotechnology. Here, we demonstrate that photocatalytic lithography, a technique already proved to be useful in materials science, can act as a dry etching technique for noble metal nanoparticles. Triangular silver nanoprisms are self-assembled on titanium dioxide films and photocatalytically shaped into discoidal particles upon irradiation with near-UV light. The obtained patterned surfaces show a dramatically different surface-enhanced Raman scattering response, suggesting the utility of our approach for the development of sensors. The photocatalytic nature of the particle shaping is demonstrated and a plausible mechanism drawn by performing photocatalysis in different configurations (direct and remote) and by irradiating in different solvents.File | Dimensione | Formato | |
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