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Malviya D, Pawade V, Bhanvase B. Ultrasound assisted synthesis of CaF
2
:Eu
3+
phosphor nanoparticles. LUMINESCENCE 2019; 34:426-431. [PMID: 30945427 DOI: 10.1002/bio.3630] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 02/19/2019] [Accepted: 03/03/2019] [Indexed: 11/11/2022]
Affiliation(s)
- D. Malviya
- Department of Chemical Engineering, Laxminarayan Institute of TechnologyRashtrasant Tukadoji Maharaj Nagpur University Nagpur MS India
| | - V.B. Pawade
- Department of Applied‐Physics, Laxminarayan Institute of TechnologyRashtrasant Tukadoji Maharaj Nagpur University Nagpur MS India
| | - B.A. Bhanvase
- Department of Chemical Engineering, Laxminarayan Institute of TechnologyRashtrasant Tukadoji Maharaj Nagpur University Nagpur MS India
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Chen H, Wang F, Moore T, Qi B, Sulejmanovic D, Hwu SJ, Mefford OT, Alexis F, Anker JN. Bright X-ray and up-conversion nanophosphors annealed using encapsulated sintering agents for bioimaging applications. J Mater Chem B 2017; 5:5412-5424. [PMID: 29497532 PMCID: PMC5826634 DOI: 10.1039/c7tb01289f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Nanophosphors are promising contrast agents for deep tissue optical imaging applications because they can be excited by X-ray and near infrared light that penetrates deeply through tissue and generates almost no autofluorescence background in the tissue. For these bioimaging applications, the nanophosophors should ideally be small, monodispersed and brightly luminescent. However, most methods used to improve luminescence yield by annealing the particles to reduce crystal and surface defects (e.g. using flux or sintering agents) also cause particle fusion or require multiple component core-shell structures. Here, we report a novel method to prepare bright, uniformly sized X-ray nanophosphors (Gd2O2S:Eu or Tb) and upconversion nanophosphors (Y2O2S: Yb/Er, or Yb/Tm) with large crystal domain size without causing aggregation. A core-shell nanoparticle is formed, with NaF only in the core. We observe that increasing the NaF sintering agent concentration up to 7.6 mol% increases both crystal domain size and luminescence intensity (up to 40% of commercial microphosphors) without affecting the physical particticle diameter. Above 7.6 mol%, particle fusion is observed. The annealing is insensitive to the cation (Na+ or K+) but varies strongly with anion, with F->Cl->CO32->Br->I-. The luminescence depends strongly on crystal domain size. The data agree reasonably well with a simple domain surface quenching model, although the size-dependence suggests additional quenching mechanisms within small domains. The prepared bright nanophosphors were subsequently functionalized with PEG-folic acid to target MCF-7 breast cancer cells which overexpress folic acid receptors. Both X-ray and upconversion nanophosphors provided low background and bright luminescence which was imaged through 1 cm chicken breast tissue at a low dose of nanophosphors 200 µL (0.1 mg/mL). We anticipate these highly monodispersed and bright X-ray and upconversion nanophosphors will have significant potential for tumor targeted imaging.
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Affiliation(s)
- Hongyu Chen
- Department of Chemistry, Department of BioEngineering, Center for Optical Materials Science and Engineering Technologies (COMSET), and Institute of Environmental Toxicology (CU-ENTOX); Clemson University, Clemson, SC, 29634, USA. Tel:+1-864-656-1726.
| | - Fenglin Wang
- Department of Chemistry, Department of BioEngineering, Center for Optical Materials Science and Engineering Technologies (COMSET), and Institute of Environmental Toxicology (CU-ENTOX); Clemson University, Clemson, SC, 29634, USA. Tel:+1-864-656-1726.
| | - Thomas Moore
- Department of Bioengineering, Clemson University, Clemson, SC, 29634, USA
| | - Bin Qi
- Department of Materials Science and Engineering and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC, 29634, USA
| | - Dino Sulejmanovic
- Department of Chemistry, Clemson University, Clemson, SC, 29634, USA
| | - Shiou-Jyh Hwu
- Department of Chemistry, Clemson University, Clemson, SC, 29634, USA
| | - O Thompson Mefford
- Department of Materials Science and Engineering and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC, 29634, USA
| | - Frank Alexis
- Department of Bioengineering, Clemson University, Clemson, SC, 29634, USA
| | - Jeffrey N Anker
- Department of Chemistry, Department of BioEngineering, Center for Optical Materials Science and Engineering Technologies (COMSET), and Institute of Environmental Toxicology (CU-ENTOX); Clemson University, Clemson, SC, 29634, USA. Tel:+1-864-656-1726.
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Ceja-Fdez A, López-Luke T, Torres-Castro A, Wheeler DA, Zhang JZ, De la Rosa E. Glucose detection using SERS with multi-branched gold nanostructures in aqueous medium. RSC Adv 2014. [DOI: 10.1039/c4ra11055b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Gold nanoparticles (AuNPs), multi-branched gold nanoparticles (MBGNs), and silica-coated MBGNs (MBGNs-silica) were studied for rhodamine B (RB) and α-glucose Raman detection at low concentration in water.
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Affiliation(s)
| | | | | | - Damon. A. Wheeler
- Department of Chemistry and Chemical Biology
- University of California
- Merced, USA
| | - Jin Z. Zhang
- Department of Chemistry and Biochemistry
- University of California
- Santa Cruz, USA
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