Surface enhanced Raman spectroscopy of self-assembled monolayers of 2-mercaptopyridine on a gold electrode

Hassan, Nazly; Holze, Rudolf

doi:10.1134/s1023193512030056

Cited by 14 publications

(7 citation statements)

References 94 publications

(109 reference statements)

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“…In addition to the graphene-related peaks we observe new peaks, which can be associated with the vibrational modes of the immobilized 2-mpy molecules. By comparison with literature values, [68][69][70] we can assign the peaks to specifi c modes of 2-mpy unambiguously (see Table 1 ). It is worth mentioning that however, we did not see any of the 2-mpy bands on the anti-Stokes side of the spectrum.…”

Section: Resultsmentioning

confidence: 73%

“…This protocol that is typically used in the realization of self-assembled monolayers (SAMs) ensures that we have at most a single layer of 2-mpy molecules on the nanoaparticles in the ideal situation. By comparison with literature values, [68][69][70] we can assign the peaks to specifi c modes of 2-mpy unambiguously (see Table 1 ). The peak-positions shown in the Figure are extracted by visual examination (see also Figure S9 for more spectra).…”

Section: Resultsmentioning

confidence: 75%

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Tunable Enhancement of Raman Scattering in Graphene‐Nanoparticle Hybrids

Balasubramanian

Zuccaro

Kern

2014

Adv Funct Materials

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The realization of graphene‐gold‐nanoparticle (G‐AuNP) hybrids is presented here through a versatile electrochemical approach, which allows the continuous tuning of the size and density of the particles obtainable on the graphene surface. Raman scattering from graphene, which is significantly enhanced in such hybrids, is systematically investigated as a function of the size and density of particles at the same location. In agreement with theory, it is shown that the Raman enhancement is tunable by varying predominantly the density of the nanoparticles. Furthermore, it is observed that the increase in Raman cross‐section and the strength of Raman enhancement varies as a function of the frequency of the vibrational mode, which may be correlated with the plasmonic fingerprint of the deposited AuNPs. In addition to this electromagnetic enhancement, support is found for a chemical contribution through the occurrence of charge transfer from the AuNPs onto graphene. Finally, G‐AuNP hybrids can be efficiently utilized as SERS substrates for the detection of specifically bound non‐resonant molecules, whose vibrational modes can be unambiguously identified. With the possibility to tune the degree of Raman enhancement, this is a platform to design and engineer SERS substrates to optimize the detection of trace levels of analyte molecules.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 75%

Tunable Enhancement of Raman Scattering in Graphene‐Nanoparticle Hybrids

Balasubramanian

Zuccaro

Kern

2014

Adv Funct Materials

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“…1a) (used in this work) has strong coordination capability and can even self-assemble on metal surfaces. 32 Both the sulfur atom in the mercapto group and the nitrogen atom in the pyridine ring are capable of coordinating with the uncoordinated Pb 2+ (Fig. 1b), 33,34 which is the most serious deep level defect on the perovskite film surface.…”

Section: Spp Processmentioning

confidence: 99%

Solid–solid chemical bonding featuring targeted defect passivation for efficient perovskite photovoltaics

Luo

Zheng

Wang

et al. 2023

Energy Environ. Sci.

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“…[48] As illustrated in Figure 4e, the Raman bands of API and PbI 2 were 1347.1and 95.6 cm −1 , respectively (the details for Raman test of the liquid-API see the "Experimental section"). [49,50] Meanwhile, the intense Raman band associated with the N atom (R-C ═ N, ≈1347.1 cm −1 ) in API becomes extremely weak and shifted to 1341.2 cm −1 in API-PbI 2 (details for API-PbI 2 preparation are shown in the "Experimental section" and Figure S11 in the Supporting Information), indicating the presence of Pb-N interaction between N (R-C ═ N) and PbI 2 . [49] In addition, as shown in Figure S12a (Supporting Information), the XRD diffraction peak of PbI 2 disappears in the API+PbI 2 , demonstrating irreversible binding of API and PbI 2 .…”

Section: Resultsmentioning

confidence: 99%

Modulation of Buried Interface by 1‐(3‐aminopropyl)‐Imidazole for Efficient Inverted Formamidinium‐Cesium Perovskite Solar Cells

Wang,

Ye,

Song

et al. 2023

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Considering the direct influence of substrate surface nature on perovskite (PVK) film growth, buried interfacial engineering is crucial to obtain ideal perovskite solar cells (PSCs). Herein, 1‐(3‐aminopropyl)‐imidazole (API) is introduced at polytriarylamine (PTAA)/PVK interface to modulate the bottom property of PVK. First, the introduction of API improves the growth of PVK grains and reduces the Pb2+ defects and residual PbI2 present at the bottom of the film, contributing to the acquisition of high‐quality PVK film. Besides, the presence of API can optimize the energy structure between PVK and PTAA, which facilitates the interfacial charge transfer. Density functional theory (DFT) reveals that the electron donor unit (R‐C ═ N) of the API prefers to bind with Pb2+ traps at the PVK interface, while the formation of hydrogen bonds between the R‐NH2 of API and I− strengthens the above binding ability. Consequently, the optimum API‐treated inverted formamidinium‐cesium (FA/Cs) PSCs yields a champion power conversion efficiency (PCE) of 22.02% and exhibited favorable stability.

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Surface enhanced Raman spectroscopy of self-assembled monolayers of 2-mercaptopyridine on a gold electrode

Cited by 14 publications

References 94 publications

Tunable Enhancement of Raman Scattering in Graphene‐Nanoparticle Hybrids

Tunable Enhancement of Raman Scattering in Graphene‐Nanoparticle Hybrids

Solid–solid chemical bonding featuring targeted defect passivation for efficient perovskite photovoltaics

Modulation of Buried Interface by 1‐(3‐aminopropyl)‐Imidazole for Efficient Inverted Formamidinium‐Cesium Perovskite Solar Cells

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