TY - JOUR

T1 - Low-temperature catalyzed growth and plasmonic properties of columnar Au-SiOx nanocomposite thin films

AU - Khmel, Sergey

AU - Starinskiy, Sergey V.

AU - Baranov, Evgeniy A.

AU - Zamchiy, Alexandr

AU - Safonov, Alexey

AU - Shukhov, Yuri

AU - Bulgakov, Alexander

N1 - The authors thank Dr. E.A. Maximovskiy for the help with the SEM measurements. The authors are also grateful to the Center of collective use of devices and equipment “High Technologies and Analytics of Nanosystems” at Novosibirsk State University for kindly providing instrumentation for the TEM measurements. The work was carried out under the state contract with IT SB RAS. AVB acknowledges financial support from the European Regional Development Fund and the state budget of the Czech Republic (Project BIATRI: CZ.02.1.01/0.0/0.0/15_003/0000445). Публикация для корректировки.

PY - 2023

Y1 - 2023

N2 - The optical properties of noble metal nanoparticles (NPs) can be efficiently controlled by their incorporation into host matrix films. Here, we report on the fabrication of composite films of gold NPs in a silicon suboxide matrix by a novel approach using a combination of pulsed laser deposition for NP production and gas-jet, electron-beam plasma chemical vapor deposition for low-temperature (300°C) synthesis of a SiOx (x = 0.38–1.55) thin film as a matrix for the NPs. The produced nanocomposite exhibits unexpected plasmonic properties, non-monotonically dependent on the matrix thickness, due to a porous columnar matrix structure grown from the NPs with variable oxygen content along the columns. This implies that low-temperature, gold-catalyzed oxidation of silicon occurs during the structure growth. Calculations based on Mie theory show that the refractive index of the obtained SiOx matrix can be as low as 1.2 at certain film thicknesses. Mechanisms of the columnar structure formation at different deposition stages are discussed. The synthesis approach can be used for the fabrication of optical thin-film materials with controllable low refractive index.

AB - The optical properties of noble metal nanoparticles (NPs) can be efficiently controlled by their incorporation into host matrix films. Here, we report on the fabrication of composite films of gold NPs in a silicon suboxide matrix by a novel approach using a combination of pulsed laser deposition for NP production and gas-jet, electron-beam plasma chemical vapor deposition for low-temperature (300°C) synthesis of a SiOx (x = 0.38–1.55) thin film as a matrix for the NPs. The produced nanocomposite exhibits unexpected plasmonic properties, non-monotonically dependent on the matrix thickness, due to a porous columnar matrix structure grown from the NPs with variable oxygen content along the columns. This implies that low-temperature, gold-catalyzed oxidation of silicon occurs during the structure growth. Calculations based on Mie theory show that the refractive index of the obtained SiOx matrix can be as low as 1.2 at certain film thicknesses. Mechanisms of the columnar structure formation at different deposition stages are discussed. The synthesis approach can be used for the fabrication of optical thin-film materials with controllable low refractive index.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85174568598&origin=inward&txGid=4954d9e8b2623f45185f61832f2d567b

UR - https://www.mendeley.com/catalogue/4252f085-9868-3c9f-a6fb-d8e8a1acc35c/

U2 - 10.1615/interfacphenomheattransfer.2023047643

DO - 10.1615/interfacphenomheattransfer.2023047643

M3 - Article

VL - 11

SP - 75

EP - 85

JO - Interfacial Phenomena and Heat Transfer

JF - Interfacial Phenomena and Heat Transfer

SN - 2169-2785

IS - 1

ER -