Formation, Stability, and Replacement of Thiol Self‐Assembled Monolayers as a Practical Guide to Prepare Nanogaps in Nanoparticle‐on‐Mirror Systems

Huynh, Ly Thi Minh; Lee, Suhyun; Yoon, Sangwoon

doi:10.1002/bkcs.11830

Cited by 7 publications

(7 citation statements)

References 26 publications

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“…The signal amplitude decreases for both higher (i.e., region I) and lower molecule concentrations (i.e., region II), indicating that quantum enhancement limit regime was approached at this concentration, agreeing well with previously reported literature: [ 65 ] that is, this concentration of 1 m m was mostly used to form a SAM of 4‐MBT molecules in previous works. [ 66,67 ] In particular, in the low concentration region II, those measured data points can be fitted using the Langmuir model: [ 68 ]

\begin{matrix} I = α \frac{K C^{n}}{1 + K C^{n}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Large‐Scale Sub‐1‐nm Random Gaps Approaching the Quantum Upper Limit for Quantitative Chemical Sensing

Zhang

Singer

et al. 2020

Advanced Optical Materials

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Metallic nanostructures with nanogap features can confine electromagnetic fields into extremely small volumes. In particular, as the gap size is scaled down to sub‐nanometer regime, the quantum effects for localized field enhancement reveal the ultimate capability for light–matter interaction. Although the enhancement factor approaching the quantum upper limit has been reported, the grand challenge for surface‐enhanced vibrational spectroscopic sensing remains in the inherent randomness, preventing uniformly distributed localized fields over large areas. Herein, a strategy to fabricate high‐density random metallic nanopatterns with accurately controlled nanogaps, defined by atomic‐layer‐deposition and self‐assembled‐monolayer processes, is reported. As the gap size approaches the quantum regime of ≈0.78 nm, its potential for quantitative sensing, based on a record‐high uniformity with the relative standard deviation of 4.3% over a large area of 22 mm × 60 mm, is demonstrated. This superior feature paves the way towards more affordable and quantitative sensing using quantum‐limit‐approaching nanogap structures.

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\begin{matrix} I = α \frac{K C^{n}}{1 + K C^{n}} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Large‐Scale Sub‐1‐nm Random Gaps Approaching the Quantum Upper Limit for Quantitative Chemical Sensing

Zhang

Singer

et al. 2020

Advanced Optical Materials

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“…This advantageous trait enables SAMs to be utilized in a wide array of applications, such as surface wetting, biosensors, nanolithography, and electronic devices 1–4 . SAMs derived from organic thiols or disulfides on Au(111) have been extensively studied due to their high structural order and chemical stability resulting from strong chemical interactions between the sulfur headgroup and the gold surface 1–4,19–24 . Discovery of new precursors for SAM formation is critical to achieving better understanding of the self‐assembly mechanism, surface structure, molecular orientations, and chemical stability of SAMs.…”

Section: Figurementioning

confidence: 99%

“…[1][2][3][4] SAMs derived from organic thiols or disulfides on Au(111) have been extensively studied due to their high structural order and chemical stability resulting from strong chemical interactions between the sulfur headgroup and the gold surface. [1][2][3][4][19][20][21][22][23][24] Discovery of new precursors for SAM formation is critical to achieving better understanding of the self-assembly mechanism, surface structure, molecular orientations, and chemical stability of SAMs. New SAM precursors may provide novel opportunities for practical application of SAMs.…”

mentioning

confidence: 99%

Molecular Self‐Assembly of Phenylselenyl Chloride on a Au(111) Surface

Han

Seong

Han

et al. 2020

Bulletin Korean Chem Soc

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“…The functionalization of solid surfaces with nanoscale precision can be achieved using self‐assembled monolayers (SAMs) formed by adsorption of various adsorbates 1–16 . Therefore, SAMs have been extensively used in nanoscience and nanotechnology such as molecular sensors, 17 bio‐interface, 1,18,19 nanopatterning, 1,20 and molecular electronics 2,21–23 .…”

Section: Introductionmentioning

confidence: 99%

Steric Effects on the Formation of Self‐Assembled Monolayers of Alicyclic Thiol Derivatives on Au(111)

Seong

Kwon

Han

et al. 2021

Bulletin Korean Chem Soc

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To understand the steric effects on the formation of alicyclic thiolate self‐assembled monolayers on Au(111), the surface structures and reductive desorption behaviors of self‐assembled monolayers on Au(111) derived from cyclohexanethiol (CHT) and 1‐methylcyclohexanethiols (MCHT) were characterized using scanning tunneling microscopy (STM) and cyclic voltammetry. STM observations showed that the adsorption of CHT on Au(111) resulted in the formation of well‐organized monolayers with an unit cell of a = 14.5 ± 0.3 Å and b = 10.2 ± 0.3 Å, while the adsorption of MCHT with a methyl substituent bonded to the 1‐position of the cyclohexyl ring resulted in the formation of a disordered phase. The reductive desorption potentials for CHT and MCHT monolayers on Au electrodes were observed at −0.984 and −0.974 V, respectively. This difference in potentials can be attributed to the difference in lateral interactions, which depend on the structural order of monolayers.

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Formation, Stability, and Replacement of Thiol Self‐Assembled Monolayers as a Practical Guide to Prepare Nanogaps in Nanoparticle‐on‐Mirror Systems

Abstract: We provide practical information about the basic properties of SAMs to prepare and modify NPoM systems.

Cited by 7 publications

References 26 publications

Large‐Scale Sub‐1‐nm Random Gaps Approaching the Quantum Upper Limit for Quantitative Chemical Sensing

Large‐Scale Sub‐1‐nm Random Gaps Approaching the Quantum Upper Limit for Quantitative Chemical Sensing

Molecular Self‐Assembly of Phenylselenyl Chloride on a Au(111) Surface

Steric Effects on the Formation of Self‐Assembled Monolayers of Alicyclic Thiol Derivatives on Au(111)

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