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Quantum and carbon dots conjugated molecularly imprinted polymers as advanced nanomaterials for selective recognition of analytes in environmental, food and biomedical applications. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116306] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Ihli J, Green DC, Lynch C, Holden MA, Lee PA, Zhang S, Robinson IK, Webb SED, Meldrum FC. Super‐Resolution Microscopy Reveals Shape and Distribution of Dislocations in Single‐Crystal Nanocomposites. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Johannes Ihli
- Paul Scherrer Institut 5232 Villigen PSI Switzerland
- School of ChemistryUniversity of Leeds Leeds LS2 9JT UK
| | | | - Christophe Lynch
- Central Laser Facility, Science and Technology Facilities CouncilResearch Complex at HarwellRutherford Appleton Laboratory Didcot OX11 0QX UK
| | - Mark A. Holden
- School of ChemistryUniversity of Leeds Leeds LS2 9JT UK
- School of Physical Sciences and ComputingUniversity of Central Lancashire Preston PR1 2HE UK
| | | | - Shuheng Zhang
- School of ChemistryUniversity of Leeds Leeds LS2 9JT UK
| | - Ian K. Robinson
- London Centre for NanotechnologyUniversity College London London WC1H 0AH UK
- Brookhaven National Lab Upton NY 11973 USA
| | - Stephen E. D. Webb
- Central Laser Facility, Science and Technology Facilities CouncilResearch Complex at HarwellRutherford Appleton Laboratory Didcot OX11 0QX UK
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Ihli J, Green DC, Lynch C, Holden MA, Lee PA, Zhang S, Robinson IK, Webb SED, Meldrum FC. Super-Resolution Microscopy Reveals Shape and Distribution of Dislocations in Single-Crystal Nanocomposites. Angew Chem Int Ed Engl 2019; 58:17328-17334. [PMID: 31591809 DOI: 10.1002/anie.201905293] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Indexed: 01/08/2023]
Abstract
With their potential to offer new properties, single crystals containing nanoparticles provide an attractive class of nanocomposite materials. However, to fully profit from these, it is essential that we can characterise their 3D structures, identifying the locations of individual nanoparticles, and the defects present within the host crystals. Using calcite crystals containing quantum dots as a model system, we here use 3D stochastic optical reconstruction microscopy (STORM) to locate the positions of the nanoparticles within the host crystal. The nanoparticles are shown to preferentially associate with dislocations in a manner previously recognised for atomic impurities, rendering these defects visible by STORM. Our images also demonstrate that the types of dislocations formed at the crystal/substrate interface vary according to the nucleation face, and dislocation loops are observed that have entirely different geometries to classic misfit dislocations. This approach offers a rapid, easily accessed, and non-destructive method for visualising the dislocations present within crystals, and gives insight into the mechanisms by which additives become occluded within crystals.
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Affiliation(s)
- Johannes Ihli
- Paul Scherrer Institut, 5232, Villigen PSI, Switzerland.,School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK
| | - David C Green
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK
| | - Christophe Lynch
- Central Laser Facility, Science and Technology Facilities Council, Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Mark A Holden
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK.,School of Physical Sciences and Computing, University of Central Lancashire, Preston, PR1 2HE, UK
| | - Phillip A Lee
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK
| | - Shuheng Zhang
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK
| | - Ian K Robinson
- London Centre for Nanotechnology, University College London, London, WC1H 0AH, UK.,Brookhaven National Lab, Upton, NY, 11973, USA
| | - Stephen E D Webb
- Central Laser Facility, Science and Technology Facilities Council, Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Fiona C Meldrum
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK
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Soleymani J, Hasanzadeh M, Somi MH, Jouyban A. Nanomaterials based optical biosensing of hepatitis: Recent analytical advancements. Trends Analyt Chem 2018. [DOI: 10.1016/j.trac.2018.08.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Moro L, Turemis M, Marini B, Ippodrino R, Giardi MT. Better together: Strategies based on magnetic particles and quantum dots for improved biosensing. Biotechnol Adv 2017; 35:51-63. [DOI: 10.1016/j.biotechadv.2016.11.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 09/29/2016] [Accepted: 11/27/2016] [Indexed: 12/14/2022]
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Thakur M, Kumawat MK, Srivastava R. Multifunctional graphene quantum dots for combined photothermal and photodynamic therapy coupled with cancer cell tracking applications. RSC Adv 2017. [DOI: 10.1039/c6ra25976f] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
An Indian fig tree serves as a green factory by providing withered leaves as a carbon source for graphene quantum dots synthesis. The quantum dots are multi-functional and have tremendous theranostic biomedical applications.
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Affiliation(s)
- Mukeshchand Thakur
- Department of Biosciences and Bioengineering
- Indian Institute of Technology Bombay
- Mumbai
- India
| | - Mukesh Kumar Kumawat
- Department of Biosciences and Bioengineering
- Indian Institute of Technology Bombay
- Mumbai
- India
| | - Rohit Srivastava
- Department of Biosciences and Bioengineering
- Indian Institute of Technology Bombay
- Mumbai
- India
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Smyder JA, Amori AR, Odoi MY, Stern HA, Peterson JJ, Krauss TD. The influence of continuous vs. pulsed laser excitation on single quantum dot photophysics. Phys Chem Chem Phys 2014; 16:25723-8. [PMID: 24950616 DOI: 10.1039/c4cp01395f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The impact of pulsed versus continuous wave (cw) laser excitation on the photophysical properties of single quantum dots (QDs) has been investigated in an experiment in which all macroscopic variables are identical except the nature of laser excitation. Pulsed excitation exaggerates the effects of photobleaching, results in a lower probability of long ON fluorescence blinking events, and leads to shorter fluorescence lifetimes with respect to cw excitation at the same wavelength and average intensity. Spectral wandering, biexciton quantum yields, and power law exponents that describe fluorescence blinking are largely insensitive to the nature of laser excitation. These results explicitly illustrate important similarities and differences in fluorescence dynamics between pulsed and cw excitation, enabling more meaningful comparisons between literature reports and aiding in the design of new experiments to mitigate possible influences of high photon flux on QDs.
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Affiliation(s)
- Julie A Smyder
- Departments of Chemistry, University of Rochester, Rochester, New York 14627, USA.
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Chen Y, Liang H. Applications of quantum dots with upconverting luminescence in bioimaging. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 135:23-32. [DOI: 10.1016/j.jphotobiol.2014.04.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 04/01/2014] [Accepted: 04/07/2014] [Indexed: 10/25/2022]
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Shibu ES, Hamada M, Nakanishi S, Wakida SI, Biju V. Photoluminescence of CdSe and CdSe/ZnS quantum dots: Modifications for making the invisible visible at ensemble and single-molecule levels. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2013.10.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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