Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Colloidal quantum dots (cQDs), semiconductor materials with widely tunable properties, can be printed in submicrometer patterns through electrohydrodynamic printing, avoiding aggressive photolithography steps. Postprinting ligand exchange determines the final optoelectronic properties of the cQD structures. However, achieving a complete bulk exchange is challenging, and the conventional vibrational analysis lacks the required spatial resolution. Infrared nanospectroscopy enables quantitative analysis of vibrational signals and structural topography on the nanometer scale upon ligand substitution on lead sulfide cQDs. A solution of ethanedithiol led to rapid (∼60 s) exchange of ≤90% of the ligands, in structures up to ∼750 nm thick. Prolonged exposures (>1 h) caused the degradation of the microstructures, with a systematic removal of cQDs regulated by surface:bulk ratios and solvent interactions. This study establishes a method for the development of devices through a combination of tunable photoactive materials, additive manufacturing of microstructures, and their quantitative nanometer-scale analysis.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11378332 | PMC |
| http://dx.doi.org/10.1021/acs.nanolett.4c02631 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Immunoelectron microscopy: a comprehensive guide from sample preparation to high-resolution imaging.
Discov Nano
September 2025
Department of Rehabilitation Medicine, Rehabilitation Medical Center, Key Laboratory of Rehabilitation Medicine in Sichuan Province, West China Hospital, Sichuan University, Chengdu, 610041, People's Republic of China.
Immunoelectron Microscopy (IEM) is a technique that combines specific immunolabeling with high-resolution electron microscopic imaging to achieve precise spatial localization of biomolecules at the subcellular scale (< 10 nm) by using high-electron-density markers such as colloidal gold and quantum dots. As a core tool for analyzing the distribution of proteins, organelle interactions, and localization of disease pathology markers, it has irreplaceable value, especially in synapse research, pathogen-host interaction mechanism, and tumor microenvironment analysis. According to the differences in labeling sequence and sample processing, the IEM technology system can be divided into two categories: the first is pre-embedding labeling, which optimizes the labeling efficiency through the pre-exposure of antigenic epitopes and is especially suitable for the detection of low-abundance and sensitive antigens; the second is post-embedding labeling, which relies on the low-temperature resin embedding (e.
View Article and Find Full Text PDFCarbon quantum dot-aptamer/MoS nanosheet fluorescent sensor for ultrasensitive, noninvasive cortisol detection.
Anal Bioanal Chem
September 2025
Hebei Key Laboratory of Public Health Safety, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, College of Public Health, College of Chemistry and Materials Science, Hebei University, Baoding, 071002, China.
This work presents the development of a highly sensitive, selective, and efficient aptamer-based fluorescent sensor for detecting cortisol in human urine. Carbon quantum dots-nucleic acid aptamer (CQDs-Apt) synthesized with excellent photoluminescent properties and stability, were selected as the fluorescent probe. In the presence of MoS-NSs, CQDs-Apt adsorbed onto the surface of MoS-NSs via electrostatic and π-π interactions, leading to strong and rapid fluorescence quenching due to static quenching mechanism between them.
View Article and Find Full Text PDFZinc Phosphate Passivation Enables Photostable Pixelated Quantum Dot Color Conversion Layers for Display Applications.
J Phys Chem Lett
September 2025
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300401, P. R. China.
Quantum dots (QDs) converted to micro light-emitting diodes (LEDs) have emerged as a promising technology for next-generation display devices. However, their commercial application has been hindered by the susceptibility of QDs to photodegradation when directly exposed to an open environment. Here, we develop functional ligand zinc bis[2-(methacryloyloxy)ethyl] phosphate (Zn(BMEP)) to passivate QD surface anions through a phosphine-mediated surface reaction.
View Article and Find Full Text PDFAtomistically resolved hot exciton relaxation dynamics in CdSe quantum dots: Experiment and theory.
J Chem Phys
September 2025
Department of Chemistry, McGill University, Montreal, Quebec H3A 0G4, Canada.
Semiconductor quantum dots (QDs) are well known to give rise to a quantum confined structure of excitons. Because of this quantum confinement, new physics of hot exciton relaxation dynamics arises. Decades of work using transient absorption (TA) spectroscopy have yielded initial simple observations, such as estimates of the cooling rate from single pump photon energy experiments.
View Article and Find Full Text PDFAbsorption properties of boron nitride quantum dots: effects of solvents.
Phys Chem Chem Phys
September 2025
Dubna State University, 141982 Dubna, Russia.
Boron nitride quantum dots combine several unique properties, including chemical stability, biocompatibility, and low cytotoxicity. These properties and tunable optical characteristics make them promising for use in boron neutron capture therapy simultaneously as therapeutic agents and fluorescent markers for cancer cells. In this paper we present a case study, in which the electronic structure of these dots is analyzed using DFT and TD-DFT methods providing a deeper understanding of their absorption properties.
View Article and Find Full Text PDF