Gallium nanoparticles colloids synthesis for UV bio-optical sensors

Flavio Nucciarelli; Iria Bravo; Luis Vázquez; Encarnación Lorenzo; Jose Luis Pau

doi:10.1117/12.2265883

16 May 2017 Gallium nanoparticles colloids synthesis for UV bio-optical sensors

Flavio Nucciarelli, Iria Bravo, Luis Vázquez, Encarnación Lorenzo, Jose Luis Pau

Proceedings Volume 10231, Optical Sensors 2017; 1023127 (2017) https://doi.org/10.1117/12.2265883
Event: SPIE Optics + Optoelectronics, 2017, Prague, Czech Republic

Abstract

A new method for the synthesis of colloidal gallium nanoparticles (Ga NPs) based on the thermal evaporation of Ga on an expendable aluminum zinc oxide (AZO) layer is presented here. The growth of AZO layers was investigated on different substrates at room temperature and 300 °C. By means of physical evaporation process, nanoparticles were deposited with a distribution ranging from 10 nm to 80 nm in diameter. A study of their endurance in acidic environment was carried out in order to assure the NPs shape and size stability during the etching process. Smaller particles start to disappear between 1h and 2h immersion time in a pH=1 solution, while bigger particles reduce their dimension. The NPs were dispersed in tetrahydrofuran (THF) organic solvent and optically characterized, showing strong UV absorption with a band centered at 280 nm. The colloids size distribution of as-evaporated samples was compared with the distribution obtained in droplets of the solution after drop-casting. By Dipole Discrete Approximation simulations, a close relationship between the UV absorption and the NPs with diameter smaller than ~40 nm was found. Because of the gallium oxide (Ga_1-xO_x) outer shell that surrounds the Ga NPs, an enhancement of their hydrophobicity occurs. Hence, the low agglomeration state between NPs in tetrahydrofuran allows to obtain narrow absorption band in the optical spectrum.

Citation Download Citation

Flavio Nucciarelli, Iria Bravo, Luis Vázquez, Encarnación Lorenzo, and Jose Luis Pau "Gallium nanoparticles colloids synthesis for UV bio-optical sensors", Proc. SPIE 10231, Optical Sensors 2017, 1023127 (16 May 2017); https://doi.org/10.1117/12.2265883

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KEYWORDS

Nanoparticles

Gallium

Ultraviolet radiation

Absorption

Sensors

Particles

Aluminum

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