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Influence of Ag and Au Doping Ratio on TiO2 Nanostructures Synthesized by the Solvothermal Method

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Abstract:

In this study, TiO2 nanoparticles (NPs) were co-doped with silver (Ag) and gold (Au) via a solvothermal method conducted at for 30 min to enhance their structural, morphological, and optical properties. The TiO2 samples were prepared as follow: pure TiO2, TiO2 doped with 0.5% Ag:1% Au, 1% Ag:0.5% Au and 1% Ag:1% Au NPs named as, S0, S1, S2 and S3, respectively. The samples were annealed at for 2 hours. Several characterizing methods namely; XRD, FTIR, AAS, FESEM, EDX and PL were used to investigate the presences of doping ratios with noble metals and their effects on the structural, morphological and optical properties of TiO2. The XRD results revealed that the average crystallite size of the doped samples decreased compared to the un-doped TiO2. The average crystallite size of S0, S1, S2 and S3 were found to be 13.56, 12.69, 11.76 and 11.49 nm, respectively, which can be related to the inhibition of crystal growth due to doping. FTIR analysis confirmed slight shifts and changes in intensity in O-H and C-O bands suggest the interaction between the TiO2 matrix and the Ag/Au dopants, indicating successful surface modification and potential changes in surface chemistry. AAS revealed the presence of Ag and Au. The average particle size of S0, S1, S2 and S3 were found to be 23.82, 20.05, 19.25 and 18.89 nm, respectively. At the same time, element mapping images confirmed the homogeneous spatial distribution and incorporation of Ag and Au in the doped samples. PL analysis indicated that doping TiO2 with Ag/Au NPs significantly decreases electron –hole recombination.

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Journal of Nano Research (Volume 92)

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57-74

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https://doi.org/10.4028/p-i9bhCw

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March 2026

Authors:

Basma A. Abbas*, Noor J. Ridha, Khawla J. Tahir, Mohammad Hafizuddin Jumali

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Ag/Au Doped TiO2 Nanoparticles, Optical Properties, Solvothermal Method, Sructural Properties, TiO2 Nanoparticles

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