Optimization of SERS substrate performance by surface functionalization of glass in  the photochemical method

Nguyen Thi Bich Ngoc; Nguyen Trong Nghia; Nguyen Thi Thuy; Nguyen Duc Toan; Doan Cat Cong; Nghiem Thi Ha Lien; Pham Hong Minh

doi:10.15625/2525-2518/22640

Author affiliations

Authors

Nguyen Thi Bich Ngoc \(^1\) Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0001-8158-0390
Nguyen Trong Nghia \(^1\) Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0001-8232-0363
Nguyen Thi Thuy \(^1\) Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam
Nguyen Duc Toan \(^1\) Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam
Doan Cat Cong \(^2\) Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam
Nghiem Thi Ha Lien \(^1\) Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0001-7219-8659
Pham Hong Minh \(^1\) Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Nghia Do Ward, Ha Noi, Viet Nam https://orcid.org/0000-0002-6932-886X

DOI:

https://doi.org/10.15625/2525-2518/22640

Keywords:

photochemical synthesis, SERS substrates, silver nanoparticles, group functionalized glass surface, SERS

Abstract

Photochemical synthesis has gained popularity for the fabrication of high-performance surface-enhanced Raman scattering (SERS) substrates, eliminating the need for reagents or complex equipment. In this paper, a laser device system was designed and constructed using a pulsed laser diode with an emission wavelength of 405 nm. This system was employed to transform small spherical silver nanoparticles (AgNPs) into different morphological structures on glass substrates through the photochemical process. The morphology characteristics of AgNPs were controlled by the group functionalized on the glass surface, including hydroxyl (-OH), amin (-NH₂), and carboxyl (-COOH). The results obtained demonstrate that with -NH₂ group functionalized glass substrates (G-NH₂), the main product was the petal-shaped AgNPs after an irradiation time of 150 s. In addition, due to the presence of multiple –NH₂ functional groups, the number of AgNPs on the glass surfaces increased significantly and was distributed more evenly. The morphological characteristics of AgNPs on the G-NH₂ influence the performance of SERS substrates. By optimizing the morphology characteristics of AgNPs on glass through –NH₂ functional groups, the optimal SERS substrate provided an enhancement factor (EF) of 1.5 × 10⁷ for melamine, with good uniformity and reproducibility, as indicated by a relative standard deviation (RSD) of 10.3 % and 4.7 %, respectively.

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