Temperature-dependent structural change of d-penicillamine-capped chiral gold nanoparticles investigated by infrared spectroscopy

In Situ Spectroscopic Probes for Structures and Processes at the Surface of Noble Metallic Nanoparticles

“…Infrared spectra in the 800–1800 cm −1 region before and after heating from i) 293 to ii) 373 K and iii) cooling back to the room temperature at 293 K. Reproduced with permission. [ 91 ] Copyright 2012, Elsevier.…”

“…[87] IR spectroscopy may be used to obtain structural information on transformations of adsorbates because their vibrational frequency is sensitive to the internal structures of the molecule and the external environment in which the molecule is located. [90,91] For instance, Ock et al used FTIR to inspect the structural changes in D-penicillamine on a 2-4 nm AuNP surface in air at various temperatures. [91] The symmetric and asymmetric stretching modes of COO − at ≈1392 and ≈1560 cm −1 , the bending and stretching of NH at ≈1595 and ≈3220 cm −1 implied a multiple binding interaction between D-penicillamine and the AuNP surface (Figure 8a).…”

“…[90,91] For instance, Ock et al used FTIR to inspect the structural changes in D-penicillamine on a 2-4 nm AuNP surface in air at various temperatures. [91] The symmetric and asymmetric stretching modes of COO − at ≈1392 and ≈1560 cm −1 , the bending and stretching of NH at ≈1595 and ≈3220 cm −1 implied a multiple binding interaction between D-penicillamine and the AuNP surface (Figure 8a). It was observed that most of the IR spectral features broadened as the temperature increased and weakened at the temperatures above 453 K, suggesting the desorption or structural change of D-penicillamine on the AuNP surface.…”

“…The authors used the Langmuir and Freundlich adsorption models Infrared spectra in the 800-1800 cm −1 region before and after heating from i) 293 to ii) 373 K and iii) cooling back to the room temperature at 293 K. Reproduced with permission. [91] Copyright 2012, Elsevier. to simulate the results and found that the adsorption progress was more consistent with the Freundlich adsorption model, indicating that the interactions between the adsorbed molecules on the surface need to be considered.…”

“…Figure 8. a) Temperature-dependent infrared spectra of D-penicillamine-AuNPs in 800-3800 cm −1 from 293 to 573 K. b) Recovery of the infrared spectra to the original position by cooling the sample temperature.Infrared spectra in the 800-1800 cm −1 region before and after heating from i) 293 to ii) 373 K and iii) cooling back to the room temperature at 293 K. Reproduced with permission [91]. Copyright 2012, Elsevier.…”