journal article·2021

Luminescence switching in polymerically confined carbon nanoparticles triggered by UV-light

Indrajit Srivastava, Parikshit Moitra, Dinabandhu Sar, Kevin Wang, Maha Alafeef, John Scott, Dipanjan Pan

Nanoscale· Volume 13· Issue 38
Publisher page

Abstract

Photo-caged carbon nanoparticles (CNPs) that are non-luminescent under typical microscopic illumination but can be activated by UV light have been synthesized in this work. Negatively charged "bare" CNPs with high luminescence can lose their photoluminescence (PL) when they are chemically crosslinked to a monomer and subsequently polymerized to form an intra-particulate "caged" network at the nanoscale surface. These caged particles could regain their PL emission upon UV irradiation for a sustained period (∼24 h) resulting in the photolytic cleavage of the polymer network, thus, freeing the nanoscale surface of CNPs, ultimately resulting in six-fold emission enhancement. This reversible "on-off-on" PL switching process was verified by spectroscopic techniques. We successfully demonstrated in this work that CNPs can be switched reversibly between fluorescent and non-fluorescent states by irradiation with light. These results further substantiate that the origin of PL in CNPs is a surface phenomenon and highly dependent on their nanoscale coverage.
Source: openalex_inverted_index · Quality: candidate unverified · Source record ↗

Research context

OpenAlex topics: Carbon and Quantum Dots Applications · Luminescence and Fluorescent Materials · Polydiacetylene-based materials and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Departments of Bioengineering, Materials Science & Engineering, Beckman Institute for Advanced Science & Technology, and Carle Cancer Centre at Illinois, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

Mills Breast Cancer Institute, Carle Foundation Hospital, Urbana, IL, 61801, USA

Departments of Diagnostic Radiology and Nuclear Medicine and Pediatrics, University of Maryland Baltimore, Health Sciences Facility III, 670 W Baltimore St., Baltimore, Maryland, 21201, USA

Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, Interdisciplinary Health Sciences Facility, 1000 Hilltop Circle, Baltimore, Maryland, 21250, USA

Department of Biomedical Engineering, Faculty of Engineering, Jordan University of Science and Technology, Irbid, Jordan

Illinois Sustainable Technology Centre, University of Illinois at Urbana-Champaign, Champaign, IL, 61820, USA

Funding

National Institute of Biomedical Imaging and Bioengineering

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