A5038421180- Carbon Nanotubes in Composites
- Nanopore and Nanochannel Transport Studies
- Covalent Organic Framework Applications
- Membrane Separation Technologies
- Graphene research and applications
- Mechanical and Optical Resonators
- Fullerene Chemistry and Applications
- 2D Materials and Applications
- Nanotechnology research and applications
- Membrane Separation and Gas Transport
- Ionosphere and magnetosphere dynamics
- DNA and Nucleic Acid Chemistry
- Advanced Photocatalysis Techniques
- Membrane-based Ion Separation Techniques
- Molecular Junctions and Nanostructures
- Pharmaceutical and Antibiotic Environmental Impacts
- Nanowire Synthesis and Applications
- Force Microscopy Techniques and Applications
- Ocean Waves and Remote Sensing
- Metal-Organic Frameworks: Synthesis and Applications
- Molecular Communication and Nanonetworks
- Solar and Space Plasma Dynamics
- Advanced biosensing and bioanalysis techniques
- Advanced Thermoelectric Materials and Devices
- Physics of Superconductivity and Magnetism
Center for Integrated Nanotechnologies
2021-2025
Los Alamos National Laboratory
2021-2025
Tianjin University
2021-2025
Rice University
2017-2023
Qingdao University
2017-2022
Shaanxi Normal University
2021
Collaborative Innovation Center of Chemical Science and Engineering Tianjin
2021
Los Alamos Medical Center
2021
Santa Clara University
2020
V. N. Karazin Kharkiv National University
2017
Abstract Covalent doping of single-walled carbon nanotubes (SWCNTs) can modify their optical properties, enabling applications as single-photon emitters and bio-imaging agents. We report here a simple, quick, controllable method for preparing oxygen-doped SWCNTs with desirable emission spectra. Aqueous nanotube dispersions are treated at room temperature NaClO (bleach) then UV-irradiated less than one minute to achieve optimized O-doping. The efficiency is controlled by varying surfactant...
Quantum emitters (QEs) in two-dimensional transition metal dichalcogenides (2D TMDCs) have advanced to the forefront of quantum communication and transduction research. To date, QEs capable operating O-C telecommunication bands not been demonstrated TMDCs. Here we report site-controlled creation telecom emitting over 1080 1550 nm wavelength range via coupling 2D molybdenum ditelluride (MoTe2) strain inducing nano-pillar arrays. Hanbury Brown Twiss experiments conducted at 10 K reveal clear...
Homointerface COF membrane with size and charge tunable channels exhibits superior salt rejection high water flux performance.
Pore size sieving, Donnan exclusion, and their combined effects seriously affect ion separation of membrane processes. However, traditional polymer-based membranes face some challenges in precisely controlling both charge distribution pore on the surface, which hinders performance, such as heavy metal removal. Herein, heterocharged covalent organic framework (COF) is reported by assembling two kinds ionic COF nanosheets with opposite charges different sizes. By manipulating stacking quantity...
Each structural form of single-wall carbon nanotube (SWCNT) has specific electronic and optical properties, but it not been possible to achieve spatial or energetic modulation those properties in controllable ways. We present here a simple method for using chemical reactions with single-stranded DNA (ssDNA) accomplish such modulation. When aqueous suspensions SWCNTs coated ssDNA are exposed singlet oxygen under ambient conditions, the nanotubes selectively covalent bonds guanine nucleotides....
The selective interactions between short oligomers of single-stranded DNA (ssDNA) and specific structures single-walled carbon nanotubes have been exploited in powerful methods for nanotube sorting. We report here that coated with ssDNA also display through the quenching fluorescence by dissolved oxygen. In aqueous solutions equilibrated under 1 atm O2, emission intensity from semiconducting is reduced 9 40%, varying combination sequence structure. This reverses promptly completely on...
Solid-state single-photon sources are essential building blocks for quantum photonics and information technologies. This study demonstrates promising emission from defects generated in single-wall carbon nanotubes (SWCNTs) by covalent reaction with guanine nucleotides their single-stranded DNA coatings. Low-temperature photoluminescence spectroscopy photon-correlation measurements on individual guanine-functionalized SWCNTs (GF-SWCNTs) indicate that multiple, closely spaced defect sites...
The reaction of aqueous suspensions single-wall carbon nanotubes (SWCNTs) with UV-excited sodium hypochlorite has previously been reported to be an efficient route for doping oxygen atoms. We have investigated how this system is affected by pH level, dissolved O2 content, and radical scavengers traps. Products were characterized near-IR fluorescence, Raman, XPS spectroscopy. greatly accelerated removal strongly suppressed TEMPO, a trap. Alcohols added as alter the efficiency product peak...
Covalent functionalization of single-wall carbon nanotubes (SWCNTs) can be valuable for modifying their electronic properties and creating fluorescent quantum defects. We report here a previously unreported category such reactions involving interactions photoexcited aromatic compounds with SWCNT sidewalls. When aqueous suspensions SWCNTs are exposed to organic then irradiated by UV light, defects formed in the at rates that depend on ring substituents. In aniline or iodoaniline, strong...
It is known that specific oligomers of single-stranded DNA (ssDNA) can show remarkable selectivity when coating different structural species single-wall carbon nanotubes (SWCNTs). We report (ATT)4 ssDNA coatings strongly distinguish between the two optical isomers (7,5) SWCNTs. This causes resolvable shifts in their fluorescence spectra and differences 2 orders magnitude room temperature rates displacement, as monitored through changes nanotube wavelength intensity on exposure to sodium...
Many properties and applications of single-wall carbon nanotubes (SWCNTs) depend strongly on the coatings that allow their suspension in aqueous media. We report SWCNT fluorescence is quenched by reversible physisorption dye molecules such as methylene blue, measurements quenching can be used to infer structure-specific exposures nanotube surface surrounding solution. SWCNTs suspended single-stranded DNA oligomers show dependent combination structure ssDNA base sequence. Several sequences...
Chemical reactions between semiconducting single-wall carbon nanotubes (SWCNTs) and single-stranded DNA (ssDNA) achieve spatially patterned covalent functionalization sites create coupled fluorescent quantum defects on the nanotube surface, tailoring SWCNT photophysics for applications such as single-photon emitters in information technologies. The evaluation of relaxation dynamics photoluminescence (PL) from those is essential understanding electronic structure beneficial to design light...
Understanding the conformations of physisorbed single-stranded DNA (ssDNA) oligos on single-wall carbon nanotube (SWCNT) surfaces is important for advancing basic nanoscience and developing applications in biomedicine quantum information processing. Here we report evidence that ssDNA strands are partly desorbed from surface under common conditions. SWCNT suspensions were prepared eight oligos, each containing 1 guanine 30 thymine bases but differing position within strand. Singlet oxygen...
Abstract Incorporating fluorescent quantum defects in the sidewalls of semiconducting single-wall carbon nanotubes (SWCNTs) through chemical reaction is an emerging route to predictably modify nanotube electronic structures and develop advanced photonic functionality. Applications such as room-temperature single-photon emission high-contrast bio-imaging have been aryl-functionalized SWCNTs, which binding configurations aryl group define energies emitting states. However, chemistry with...
The new oxonitridosilicate phosphor La<sub>2.31</sub>Sr<sub>3.69</sub>Si<sub>5</sub>N<sub>10.31</sub>O<sub>1.69</sub>:Pr<sup>3+</sup>could be excited with near-UV and blue light, shows a narrow-band red emission peaking at 625 nm full width half-maximum of 40 nm.
We have found that absorption spectra of single-wall carbon nanotube (SWCNT) dispersions can be accurately represented as linear combinations two underlying spectra. One, assigned to purified well-dispersed SWCNTs, is structured; the other, impurities and aggregates, diffuse. To assess quality SWCNT dispersions, a small set visible short-wave IR are first measured for dispersed sample it by centrifugation. Those data analyzed using simple arithmetic process estimate pair component Then other...