Monochromatic Blue and Switchable Blue-Green Carbon Quantum Dots by Room-Temperature Air Plasma Processing
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Author(s)
Weerasinghe, Janith
Scott, James
Deshan, Athukoralalage Don K
Chen, Dechao
Singh, Amandeep
Sen, Suvankar
Sonar, Prashant
Vasilev, Krasimir
Li, Qin
Ostrikov, Kostya Ken
Year published
2021
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Carbon quantum dots (CQDs, C-dots or CDs) are an emerging type of nanomaterial which has received immense attention due to their numerous applications. However, most of the reported CQDs in literature typically emit single emission peak under an excitation. Multipeak emissions without any complicated techniques will be ideal for various applications in the fields of ratiometric sensing, optoelectronics, and multifunctional bio-imaging systems. Here, a fast, effective, and single-step method is developed for the bulk synthesis of CQDs using atmospheric pressure air plasmas. Structural, morphological, and chemical properties ...
View more >Carbon quantum dots (CQDs, C-dots or CDs) are an emerging type of nanomaterial which has received immense attention due to their numerous applications. However, most of the reported CQDs in literature typically emit single emission peak under an excitation. Multipeak emissions without any complicated techniques will be ideal for various applications in the fields of ratiometric sensing, optoelectronics, and multifunctional bio-imaging systems. Here, a fast, effective, and single-step method is developed for the bulk synthesis of CQDs using atmospheric pressure air plasmas. Structural, morphological, and chemical properties are characterized by advanced analytical techniques. The CQDs have an average diameter of about 3 nm with a narrow size distribution. Emission wavelengths of 470 nm for blue emissive CQDs and 515 nm for green emissive CQDs are observed. Concentration dependency of the CQDs suggests that the switchable mechanism is due to the formation of PTSA excimers. Dual-emissive CQDs have the potential to be used in bi-channel ratiometric determination for metal ions, pH sensing, tumor diagnosis and detection, and solid-state lighting materials. The proof-of-principle demonstration of the use of dual-emissive CQDs (DCQDs) as a fluorescent sensor of Cu2+ ions is also presented to highlight the possible applications.
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View more >Carbon quantum dots (CQDs, C-dots or CDs) are an emerging type of nanomaterial which has received immense attention due to their numerous applications. However, most of the reported CQDs in literature typically emit single emission peak under an excitation. Multipeak emissions without any complicated techniques will be ideal for various applications in the fields of ratiometric sensing, optoelectronics, and multifunctional bio-imaging systems. Here, a fast, effective, and single-step method is developed for the bulk synthesis of CQDs using atmospheric pressure air plasmas. Structural, morphological, and chemical properties are characterized by advanced analytical techniques. The CQDs have an average diameter of about 3 nm with a narrow size distribution. Emission wavelengths of 470 nm for blue emissive CQDs and 515 nm for green emissive CQDs are observed. Concentration dependency of the CQDs suggests that the switchable mechanism is due to the formation of PTSA excimers. Dual-emissive CQDs have the potential to be used in bi-channel ratiometric determination for metal ions, pH sensing, tumor diagnosis and detection, and solid-state lighting materials. The proof-of-principle demonstration of the use of dual-emissive CQDs (DCQDs) as a fluorescent sensor of Cu2+ ions is also presented to highlight the possible applications.
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Journal Title
Advanced Materials Technologies
Funder(s)
ARC
Grant identifier(s)
IH180100002
DP200101105
Copyright Statement
© 2021 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Monochromatic Blue and Switchable Blue-Green Carbon Quantum Dots by Room-Temperature Air Plasma Processing, Advanced Materials Technologies, 2021, which has been published in final form at DOI. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)
Note
This publication has been entered as an advanced online version in Griffith Research Online.
Subject
Nanotechnology
Nanomaterials
Chemical sciences
Engineering
Physical sciences
Science & Technology
Materials Science, Multidisciplinary
atmospheric pressure plasma