A Scanning Tunneling Microscopy/Spectroscopy (STM/STS) and synchrotron X-ray diffraction study on clustered CN nanoparticles (nanoflakes) is conducted on green-chemistry synthesized samples obtained from chitosan through high power sonication. Morphological aspects and the electronic characteristics are investigated. The observed bandgap of the nanoflakes reveals the presence of different phases in the material. Combining STM morphology, STS spectra and X-ray diffraction (XRD) results one finds that the most abundant phase is graphitic CN. A high density of defects is inferred from the XRD measurements. Additionally, STM-electroluminescence (STMEL) is detected in CN nanoflakes deposited on a gold substrate. The tunneling current creates photons that are three times more energetic than the tunneling electrons of the STM sample. We ponder about the two most probable models to explain the observed photon emission energy: either a nonlinear optical phenomenon or a localized state emission.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ultsonch.2017.08.021 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Band Gap Tuning in Mercaptoacetic Acid Capped Mixed Halides Perovskites and Effect of Solvents on Their Fluorescence Dynamics: A Potential Sensor for Polarity.
J Fluoresc
January 2025
Department of Chemistry, Quaid-i-Azam University, Islamabad, 45320, Pakistan.
From synthesis to application, there are always certain interactions between the polar solvents and perovskite nanocrystals (NCs). To explain the effect of solvent polarity especially on the photoluminescence (PL) properties of NCs is highly desirable, especially for sensing applications. Herein We have synthesized the methylammonium lead mixed halides (MAPbClBr, where n = 0, 0.
View Article and Find Full Text PDFPreparation of Carbon Dots with High Fluorescence Quantum Yields and its Detection of Hg in Simulated Wastewater.
J Fluoresc
January 2025
College of Biological and Chemical Engineering, Qilu Institute of Technology, Jinan, 250200, P.R. China.
Fluorescent carbon quantum dots (CDs) have received widespread attention for their potential applications in optical sensing. Meanwhile, as the importance of mercury ion (Hg) detection in the environment, the exploration of Hg fluorescent nanosensor based on CDs with high quantum yield is particularly intriguing. Herein, nitrogen-doped carbon quantum dots (N-CDs) were prepared by microwave method using citric acid as carbon source and urea as nitrogen source, and glycerol as microwave solvent.
View Article and Find Full Text PDFMo(0) carbonyl complexes bearing the bis(3,5-dimethylpyrazole) ligand: catalysis of the regioselective [2 + 2 + 2] cycloaddition of terminal alkynes to synthesize 1,3,5-isomers.
Dalton Trans
January 2025
Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302 India.
The reaction between 1,3-bis(3,5-dimethylpyrazolylmethyl)hexahydropyrimidine L and Mo(CO) in CHCN at 130 °C afforded a binuclear Mo(0) complex 1 containing a new macrocycle formed upon C-N bond cleavage in L in good yield. Conversely, a clean reaction takes place between L and [Mo(CO)(COD)] in THF at 60 °C to give a new metalloligand complex [Mo(CO)(κ-,-L)] 2 containing a spectator pyrazole arm in 83% yield. Their structures were determined by X-ray diffraction methods, and a plausible mechanism is proposed for the C-N bond cleavage leading to complex 1.
View Article and Find Full Text PDFUnderstanding the Kinetics of CO Hydrate Formation in Dry Water for Carbon Capture and Storage: X-ray Diffraction and In Situ Raman Studies.
ACS Appl Mater Interfaces
January 2025
Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117580, Singapore.
Hydrate-based carbon capture and storage (HBCS) is a sustainable and promising approach to combating global warming by utilizing water, which is a ubiquitous resource. Here, we report a comprehensive study of CO hydrate formation in dry water (DW), a water-in-air dispersion confined in silica particles, for improving the kinetics of hydrate growth. Utilizing a combination of a home-built high-pressure reactor, in situ Raman spectroscopy, and powder X-ray diffraction (PXRD), we elucidate the crystal structure, growth dynamics, and morphology of CO hydrates formed in DW, with and without the kinetic hydrate promoter, l-tryptophan.
View Article and Find Full Text PDFOptimized K Deposition Dynamics via Potassiphilic Porous Interconnected Mediators Coordinated by Single-Atom Iron for Dendrite-Free Potassium Metal Batteries.
Adv Sci (Weinh)
January 2025
Department of Chemical Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan.
Potassium metal batteries are emerging as a promising high-energy density storage solution, valued for their cost-effectiveness and low electrochemical potential. However, understanding the role of potassiphilic sites in nucleation and growth remains challenging. This study introduces a single-atom iron, coordinated by nitrogen atoms in a 3D hierarchical porous carbon fiber (Fe─N-PCF), which enhances ion and electron transport, improves nucleation and diffusion kinetics, and reduces energy barriers for potassium deposition.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!