Novel GaN-Based Substrates with Gold Nanostructures for Ultra-Sensitive SERS Analysis: Micro-Nano Pit Morphology for Enhanced Molecular Detection

Ko, Tsung-Shine; Deng, Chen-An; Shieh, Jiann; Huang, Hung Ji; Lin, Yung-Sheng; Lin, Yang-Wei; Du, Yi-Chun

doi:10.1007/s40846-024-00889-1

J. Med. Biol. Eng.

2024

DOI: 10.1007/s40846-024-00889-1

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Novel GaN-Based Substrates with Gold Nanostructures for Ultra-Sensitive SERS Analysis: Micro-Nano Pit Morphology for Enhanced Molecular Detection

Tsung-Shine Ko,

Chen-An Deng,

Jiann Shieh

et al.

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Electric Field-Enhanced SERS Detection Using MoS2-Coated Patterned Si Substrate with Micro-Pyramid Pits

Ko,

Hsieh,

Lee

et al. 2024

Nanomaterials

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This study utilized semiconductor processing techniques to fabricate patterned silicon (Si) substrates with arrays of inverted pyramid-shaped micro-pits by etching. Molybdenum trioxide (MoO3) was then deposited on these patterned Si substrates using a thermal evaporation system, followed by two-stage sulfurization in a high-temperature furnace to grow MoS2 thin films consisting of only a few atomic layers. During the dropwise titration of Rhodamine 6G (R6G) solution, a longitudinal electric field was applied using a Keithley 2400 (Cleveland, OH, USA) source meter. Raman mapping revealed that under a 100 mV condition, the analyte R6G molecules were effectively confined within the pits. Due to its two-dimensional structure, MoS2 provides a high surface area and supports a surface-enhanced Raman scattering (SERS) charge transfer mechanism. The SERS results demonstrated that the intensity in the pits of the few-layer MoS2/patterned Si SERS substrate was approximately 274 times greater compared to planar Si, with a limit of detection reaching 10−5 M. The experimental results confirm that this method effectively resolves the issue of random distribution of analyte molecules during droplet evaporation, thereby enhancing detection sensitivity and stability.

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Electric Field-Enhanced SERS Detection Using MoS2-Coated Patterned Si Substrate with Micro-Pyramid Pits

Ko,

Hsieh,

Lee

et al. 2024

Nanomaterials

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show abstract

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Novel GaN-Based Substrates with Gold Nanostructures for Ultra-Sensitive SERS Analysis: Micro-Nano Pit Morphology for Enhanced Molecular Detection

Cited by 1 publication

References 31 publications

Electric Field-Enhanced SERS Detection Using MoS2-Coated Patterned Si Substrate with Micro-Pyramid Pits

Electric Field-Enhanced SERS Detection Using MoS2-Coated Patterned Si Substrate with Micro-Pyramid Pits

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