1
|
Affiliation(s)
- Simanta Kundu
- Department
of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Amitava Patra
- Department
of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| |
Collapse
|
2
|
Meder F, Thomas SS, Fitzpatrick LW, Alahmari A, Wang S, Beirne JG, Vaz G, Redmond G, Dawson KA. Labeling the Structural Integrity of Nanoparticles for Advanced In Situ Tracking in Bionanotechnology. ACS NANO 2016; 10:4660-4671. [PMID: 26959685 DOI: 10.1021/acsnano.6b01001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Observing structural integrity of nanoparticles is essential in bionanotechnology but not always straightforward to measure in situ and in real-time. Fluorescent labels used for tracking intrinsically nonfluorescent nanomaterials generally do not allow simultaneous observation of integrity. Consequently, structural changes like degradation and disassembly cannot easily be followed in situ using fluorescence signals. We show that thioflavin T (ThT), a fluorophore and molecular rotor known to tag specific fibril structures in amyloids, can "label" the structural integrity of widely used and intrinsically nonfluorescent, silica nanoparticles (SiNPs). Entrapment of ThT in SiNPs controls the fluorohphore's relaxation pathway and leads to a red-shifted fluorescence spectrum providing real time information on SiNP integrity. The dynamic change of ThT fluorescence during degradation of doped SiNPs is found much higher than that of common labels fluorescein and rhodamine. Degradation kinetics of core-shell structures recorded by ThT fluorescence and light scattering prove the capability to clearly distinguish structural features during SiNPs degradation and allow obtaining degradation kinetics in vitro, in biological media, in serum, and in cells. The effect is transferable to different types of materials, here shown for ThT incorporated SiNPs with tightly tailorable sizes (9-100 nm), poly(lactic-co-glycolic acid) (PLGA) nanoparticles, poly(9-vinylcarbazole) (PVK) nanoparticles, and iron-doped-SiNPs (FeSiNPs). We thus suggest molecular rotors such as ThT as additional labels to effectively and easily sense nanoparticle structural status in situ and to enhance understanding and development of programmed nanoparticle disassembly in bionanotechnology.
Collapse
Affiliation(s)
- Fabian Meder
- Centre for BioNano Interactions, University College Dublin , School of Chemistry and Chemical Biology, Belfield 4, Dublin, Ireland
| | - Steffi S Thomas
- Centre for BioNano Interactions, University College Dublin , School of Chemistry and Chemical Biology, Belfield 4, Dublin, Ireland
| | - Laurence W Fitzpatrick
- Centre for BioNano Interactions, University College Dublin , School of Chemistry and Chemical Biology, Belfield 4, Dublin, Ireland
| | - Amirah Alahmari
- Centre for BioNano Interactions, University College Dublin , School of Chemistry and Chemical Biology, Belfield 4, Dublin, Ireland
| | - Suxiao Wang
- Functional Nanomaterials, University College Dublin , School of Chemistry and Chemical Biology, Belfield 4, Dublin, Ireland
| | - Jason G Beirne
- Functional Nanomaterials, University College Dublin , School of Chemistry and Chemical Biology, Belfield 4, Dublin, Ireland
| | - Gizela Vaz
- Centre for BioNano Interactions, University College Dublin , School of Chemistry and Chemical Biology, Belfield 4, Dublin, Ireland
| | - Gareth Redmond
- Functional Nanomaterials, University College Dublin , School of Chemistry and Chemical Biology, Belfield 4, Dublin, Ireland
| | - Kenneth A Dawson
- Centre for BioNano Interactions, University College Dublin , School of Chemistry and Chemical Biology, Belfield 4, Dublin, Ireland
| |
Collapse
|
3
|
Martin C, Bhattacharyya S, Patra A, Douhal A. Single and multistep energy transfer processes within doped polymer nanoparticles. Photochem Photobiol Sci 2015; 13:1241-52. [PMID: 24969364 DOI: 10.1039/c4pp00086b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Herein, we demonstrate the design of multiple fluorophores Coumarin 153 (C153) and Nile Red (NR) encapsulated in semiconducting poly[N-vinylcarbazole] (PVK) polymer nanoparticles (50-70 nm in diameter) by a simple re-precipitation technique, and elucidate their photophysical properties by steady-state and picosecond (ps) time resolved emission spectroscopy. It is interesting to note that multistep cascaded energy transfer occurs from the excited host PVK molecules to NR dye molecules through C153. The energy transfer time constants are found to be 180 ps for PVK→C153, 360 ps for PVK→NR, and 140 ps for the overall energy transfer process from PVK to NR through C153 dye molecules. The multistep energy transfer allows tuning of the wide range emission from 350 nm to 700 nm by changing the relative concentrations of the encapsulated dye molecules. Bright, stable, and white light emission of the dye doped polymer nanoparticles with a quantum yield of 14% is achieved at a particular concentration ratio of the C153 : NR dye. The generation of "cool" white emission in suspension and in the solid state film opens up new possibilities to obtain white light OLEDs based on single nanoparticles.
Collapse
Affiliation(s)
- Cristina Martin
- Departamento de Química Física, Facultad de Ciencias del Medio Ambiente y Bioquímica e INAMOL, Universidad de Castilla-La Mancha, Avda. Carlos III, S.N., 45071 Toledo, Spain.
| | | | | | | |
Collapse
|
4
|
Wade A, Lovera P, O'Carroll D, Doyle H, Redmond G. Luminescent optical detection of volatile electron deficient compounds by conjugated polymer nanofibers. Anal Chem 2015; 87:4421-8. [PMID: 25803242 DOI: 10.1021/acs.analchem.5b00309] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Optical detection of volatile electron deficient analytes via fluorescence quenching is demonstrated using ca. 200 nm diameter template-synthesized polyfluorene nanofibers as nanoscale detection elements. Observed trends in analyte quenching effectiveness suggest that, in addition to energetic factors, analyte vapor pressure and polymer/analyte solubility play an important role in the emission quenching process. Individual nanofibers successfully act as luminescent reporters of volatile nitroaromatics at sub-parts per million levels. Geometric factors, relating to the nanocylindrical geometry of the fibers and to low nanofiber substrate coverage, providing a less crowded environment around fibers, appear to play a role in providing access by electron deficient quencher molecules to the excited states within the fibers, thereby facilitating the pronounced fluorescence quenching response.
Collapse
Affiliation(s)
- Aidan Wade
- §School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
| | - Pierre Lovera
- †Tyndall National Institute, University College Cork, Lee Maltings, Cork, Ireland
| | - Deirdre O'Carroll
- ‡Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, 607 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Hugh Doyle
- †Tyndall National Institute, University College Cork, Lee Maltings, Cork, Ireland
| | - Gareth Redmond
- §School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
| |
Collapse
|
5
|
Persano L, Camposeo A, Pisignano D. Active polymer nanofibers for photonics, electronics, energy generation and micromechanics. Prog Polym Sci 2015. [DOI: 10.1016/j.progpolymsci.2014.10.001] [Citation(s) in RCA: 137] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
6
|
Quites FJ, Faria GC, Germino JC, Atvars TDZ. Tuning Emission Colors from Blue to Green in Polymeric Light-Emitting Diodes Fabricated using Polyfluorene Blends. J Phys Chem A 2014; 118:10380-90. [DOI: 10.1021/jp503819u] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Fernando Júnior Quites
- Chemistry Institute, State University of Campinas, POB. 6154, Campinas, 13084-971 SP, Brazil
| | - Gregório Couto Faria
- Instituto de Física
de São Carlos, University of São Paulo, POB. 369, São Carlos, 13560-970 SP, Brazil
| | - José Carlos Germino
- Chemistry Institute, State University of Campinas, POB. 6154, Campinas, 13084-971 SP, Brazil
| | | |
Collapse
|