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Determination of colloidal TiO2 nanoparticles concentration produced by laser ablation of Ti in water

Pulsed laser ablation in liquid is widely-used technique for production of nanoparticles which has some advantages compared to chemical techniques, as low-cost, low time-consumption, ecological acceptability, high purity of nanoparticles, low ratio of unwanted reaction products and possibility of adjusting large number of parameters to obtain nanoparticles with wanted features. In this paper we present innovative proof-of-concept method for determination of TiO2 NP concentration in colloidal suspension produced by laser ablation of Ti target in water. The proposed method combines crater volume microscopic measurements and size- distribution of NP, which is obtained from SEM [1-4]. Laser ablation is performed with 1064 nm Nd:YAG laser at pulse rate 5Hz and different number of pulses (1000p, 3000p, 5000p). It was found that TiO2 NP distribution has maximum value at about 100 nm in diameter. TiO2 nanoparticles are dominantly amorphous as is confirmed by XRD measurements and also band- gap analysis by Tauc plot obtained from UV-VIS spectroscopy. For comparison, concentration is also calculated from UV-VIS data and Mie scattering theory, involving same size- distribution data from SEM. The validity of this proposed method is verified by comparing theoretical and experimentally obtained parameters. References: [1] N. Krstulović, S. Shannon, R. Stefanuik, C. Fanara, Int. J. Adv. Manuf. Technol. 2013, 69, 1765 [2] N. Krstulović, P. Umek, K. Salamon, I. Capan, Mater. Res. Express 2017, 4, 105003 [3] N. Krstulovic, K. Salamon, O. Budimlija, J. Kovac, J. Dasovic, P. Umek, I. Capan, Appl. Surf. Sci. 440 (2018) 916–925 [4] N. Krstulovic, S. Milosevic, Appl. Surf. Sci. 256 (2010) 4142- 4148

Colloidal nanoparticles ; TiO2 nanoparticles ; laser ablation in liquids ; nanoparticles concentration

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