Article
Chemistry, Physical
Miles Martinati, Wim Wenseleers, Lei Shi, Saied Md Pratik, Philip Rohringer, Weili Cui, Thomas Pichler, Veaceslav Coropceanu, Jean-Luc Bredas, Sofie Cambre
Summary: In this study, the excited states of ultralong carbon chains encapsulated inside double-walled carbon nanotubes were investigated using wavelength-dependent resonant Raman spectroscopy. The study identified vibronic series of two different electronic states.
Article
Spectroscopy
Trevor J. Wolfe, Nicholas A. Kruse, Mohamed M. Radwan, Amira S. Wanas, Kalee N. Sigworth, Mahmoud A. Elsohly, Nathan I. Hammer
Summary: This study presents the Raman spectra of 11 cannabinoids and compares them to simulated spectra. The results show higher peak separation in the experimental spectra and deviations in the -OH stretching region, indicating that this region is a good indicator for decarboxylation reactions in these cannabinoids.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Spectroscopy
Shuai Lian, Xun Gao, Chao Song, Hui Li, Anmin Chen, Jingquan Lin
Summary: In this study, the Raman activity spectra, frontier molecular orbitals, and molecular electrostatic potentials of CBD, THC, and their respective gold complexes were investigated. The results show that CBD is more reactive than THC, with CBD/THC-Au complexes displaying stronger chemical activities and greater charge transfer effects. The most electronegative sites of CBD and THC were identified as the adsorption sites on the gold surface.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Spectroscopy
Supriya Ghosh, Debkumar Rana, Bapi Pradhan, Patrice Donfack, Johan Hofkens, Arnulf Materny
Summary: Metal halide-based perovskite semiconductors have excellent optoelectronic properties, with mixed compositions leading to structural changes and influencing electronic properties. By using Raman spectroscopy and density functional theory (DFT), we systematically investigated the vibrational features of lead bromide-based perovskites, finding a clear correlation between Raman band wavenumbers and the choice of cations.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Materials Science, Multidisciplinary
Aleksandar Zivkovic, Dejan Gemeri, Hilke Bahmann, Igor Lukacevic, Helen E. King
Summary: Vibrational spectroscopy is used to examine bone apatite mineralogy, but the spectra may be influenced by nanoscale crystallite size and surface phonon contributions. Density functional theory simulations were conducted to test for surface phonon effects on hydroxyapatite and carbonated apatite. Surface phonons were found to significantly contribute to the vibrational spectra, affecting the frequencies of internal modes of molecular groups. The presence of surface phonons is crucial for interpreting and applying the spectral effects in bone minerals.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yu-Rui Zhang, Yuan Gao, Quan-Hao Zheng, Ting-Ting Zhang, Li-Peng Qiu, Shi-Long Gao, Xue-Tong Zhang, Wen-Peng Han, Yun-Ze Long
Summary: This study reports the superior properties of flexible multi-functional composite fibers based on graphene aerogel fibers. With the addition of phase change materials and coatings of polydimethylsiloxane and fluorocarbon, the graphene aerogel fibers demonstrate improved structural uniformity, thermal stability, and response to various external stimuli. They also exhibit excellent electrical conductivity, making them promising for advanced wearable systems.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Alyssa Spear, Oleksandr Orativskyi, Samantha Tran, Jon A. Zubieta, Robert P. Doyle
Summary: Peptide chemists are searching for fast and easy purification methods for producing disulphide bonds after solid-phase synthesis. The current methods are time-consuming, can lead to side-products and require challenging purification. In this study, a rapid and green oxidation method using a biocompatible corrin ring-containing compound called dicyanocobinamide is described. The method is conducted in aqueous solution, in air, and offers reaction times under 1 hour with simple one step removal of the catalyst.
CHEMICAL COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Sugata Chowdhury, Heather M. Hill, Albert F. Rigosi, Andrew Briggs, Helmuth Berger, David B. Newell, Angela R. Hight Walker, Francesca Tavazza
Summary: Tantalum diselenide is a metallic transition metal dichalcogenide with structure and vibrational behavior dependent on temperature and thickness, including the emergence of CDW states. Experimental Raman modes, including forbidden modes and low-frequency CDWs, were matched to DFT-predicted vibrations, supporting the vibrational visualizations. Experimental phonons observed as a function of temperature and thickness further emphasized the importance of understanding CDWs for potential solid-state quantum information platforms based on nonequilibrium phenomena.
ACS APPLIED NANO MATERIALS
(2021)
Article
Spectroscopy
Elliot J. Tay, Jonathan E. Barnsley, Daniel B. Thomas, Keith C. Gordon
Summary: Resonance Raman spectroscopy was used to identify and characterize psittacofulvins, showing different behaviors in red and yellow regions with Raman band wavenumber shifts. One yellow region exhibited similar characteristics to the red regions, suggesting the presence of psittacofulvins with greater conjugation.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Spectroscopy
V. S. Novikov, V. V. Kuzmin, S. M. Kuznetsov, M. E. Darvin, J. Lademann, E. A. Sagitova, L. Yu Ustynyuk, K. A. Prokhorov, G. Yu Nikolaeva
Summary: The study demonstrated that the positions and intensities of C-C and C=C stretching bands in Raman spectra depend on the length of the polyene chain and type of isomer. Experimental Raman spectra of beta-carotene powder matched well with DFT simulations for the all-trans form. Additionally, the presence of conjugated double bonds in a polyene structure leads to shifts in peak positions towards lower wavenumbers with increased intensities.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Biochemistry & Molecular Biology
Naznin Shaikh, Narayan N. Som, Prafaulla K. Jha, Padmaja Pamidimukkala
Summary: In this work, nanostructures comprising silver nanoparticles supported on a wrinkled chitosan matrix (Ag@Ch) were successfully synthesized for surface-enhanced Raman scattering (SERS) applications. The effect of wet, dry, and liquid samples on the SERS enhancement was studied, and detection limits for Methylene blue, Crystal Violet, and p-Nitrophenol were determined. The SERS enhancement of the Ag@Ch was attributed to both electromagnetic and chemical effects.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Nanoscience & Nanotechnology
Vignaswaran Veerapandiyan, Maxim N. Popov, Florian Mayer, Juergen Spitaler, Sarunas Svirskas, Vidmantas Kalendra, Jonas Lins, Giovanna Canu, Maria Teresa Buscaglia, Marek Pasciak, Juras Banys, Pedro B. Groszewicz, Vincenzo Buscaglia, Jiri Hlinka, Marco Deluca
Summary: This study presents an effective charge-mediated mechanism for relaxor behavior appearing at low substituent contents in heterovalent modified barium titanate ceramics, contributing to a deeper understanding of relaxor behavior in chemically modified ferroelectric materials.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Wang-Hyo Kim, Joseph Mapley, Deok-Ho Roh, Jeong Soo Kim, So Yeon Yoon, Keith C. Gordon, Tae-Hyuk Kwon
Summary: The study revealed a potential relationship between the molecular structures of photosensitizers and their charge transfer (CT) properties. It was found that the presence of triple bonds and electron donating groups enhances the CT properties of the photosensitizer, impacting the performance of dye sensitized solar cells (DSSCs).
MATERIALS TODAY ADVANCES
(2021)
Article
Materials Science, Multidisciplinary
Mohi Uddin Jewel, Samiul Hasan, Iftikhar Ahmad
Summary: This study investigates the point defects in different phases of gallium oxide (Ga2O3) using density functional theory (DFT) and generalized gradient approximation (GGA). The results show that Ga2O3 phases prefer the formation of gallium and oxygen vacancies, as well as the incorporation of extrinsic impurities. The charge transition energy levels are found to be deep inside the bandgap regardless of the Ga2O3 phase and growth environment. The impact of temperature on intrinsic point defects is analyzed by studying the vibrational modes of 13-Ga2O3 thin films grown in an oxygen-rich environment.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Qin Yang, Julien Bloino, Hana Sestakova, Jaroslav Sebestik, Jiri Kessler, Jana Hudecova, Josef Kapitan, Petr Bour
Summary: Resonance Raman optical activity (RROA) spectra are a powerful tool to study molecular structure, chirality, and excited electronic properties. In this study, RROA spectra of a Co(III) complex were recorded and analyzed, revealing significant signal enhancement, unique resonance spectral pattern, and molecular behavior.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)