Dual-Mode Fluorescence and Visual Fluorescent Test Paper Detection of Copper Ions and EDTA

Xu, Wanqing; Hao, Xiaoliang; Li, Tongtong; Dai, Shujuan; Fang, Zhigang

doi:10.1021/acsomega.1c04406

Cited by 22 publications

(2 citation statements)

References 35 publications

(53 reference statements)

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“…It is known that the addition of tertiary amines can promote the electron transfer between CQDs and Cu II . , We thus added Na 2 EDTA to the system with 0.25 mg/mL CQDs and [HEA]:[HEBiB]:[CuBr 2 ]:[TPMA] = 100:1:0.03:0.18. The amount of Na 2 EDTA in the system increased from 1 mM to 10 mM, and the reaction time surprisingly reduced to less than 1 min for 90% monomer conversion (Figure d and Table , entries 6–8).…”

Section: Resultsmentioning

confidence: 99%

Ultrafast Visible-Light-Induced ATRP in Aqueous Media with Carbon Quantum Dots as the Catalyst and Its Application for 3D Printing

et al. 2022

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Photoinduced atom transfer radical polymerization (ATRP) has been proved to be a versatile technique for polymer network formation. However, the slow polymerization rates of typical ATRP limited its application in the field of additive manufacturing (3D printing). In this work, we introduced carbon quantum dots (CQDs) for the first time to the ATRP in aqueous media and developed an ultrafast visible-light-induced polymerization system. After optimization, the polymerization could achieve a high monomer conversion (>90%) within 1 min, and the polydispersity index (PDI) of the polymer was lower than 1.25. This system was then applied as the first example of ATRP for the 3D printing of hydrogel through digital light processing (DLP), and the printed object exhibited good dimensional accuracy. Additionally, the excellent and stable optical properties of CQDs also provided interesting photoluminescence capabilities to the printed objects. We deduce this ATRP mediated 3D printing process would provide a new platform for the preparation of functional and stimuli-responsive hydrogel materials.

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Section: Resultsmentioning

confidence: 99%

Ultrafast Visible-Light-Induced ATRP in Aqueous Media with Carbon Quantum Dots as the Catalyst and Its Application for 3D Printing

et al. 2022

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“…In fact, a great deal of research has focused on the synthesis of fluorescent CDs for chelating with and selectively detecting different heavy metal ions [ 27 , 28 , 29 ]. Within this framework, fluorescent sensing of Cu(II) ions has been the topic of many studies, both exploiting fluorescence quenching and turn-on effects [ 30 , 31 , 32 , 33 , 34 , 35 ]. Differently, absorption-based sensing of copper through CDs has rarely been reported [ 36 ] and deserves further investigations in view of applications to easy-to-use visual colorimetric devices.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Sensing Properties of N and S Co-Doped Carbon Dots for Colorimetric Detection of Copper and Cobalt in Water

Bisauriya

Antonaroli

Ardini

et al. 2022

Sensors

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In this study, nitrogen and sulfur co-doped carbon dots (NS-CDs) were investigated for the detection of heavy metals in water through absorption-based colorimetric response. NS-CDs were synthesized by a simple one-pot hydrothermal method and characterized by TEM, STEM-coupled with energy dispersive X-ray analysis, NMR, and IR spectroscopy. Addition of Cu(II) ions to NS-CD aqueous solutions gave origin to a distinct absorption band at 660 nm which was attributed to the formation of cuprammonium complexes through coordination with amino functional groups of NS-CDs. Absorbance increased linearly with Cu(II) concentration in the range 1–100 µM and enabled a limit of detection of 200 nM. No response was observed with the other tested metals, including Fe(III) which, however, appreciably decreased sensitivity to copper. Increase of pH of the NS-CD solution up to 9.5 greatly reduced this interference effect and enhanced the response to Cu(II), thus confirming the different nature of the two interactions. In addition, a concurrent response to Co(II) appeared in a different spectral region, thus suggesting the possibility of dual-species multiple sensitivity. The present method neither requires any other reagents nor any previous assay treatment and thus can be a promising candidate for low-cost monitoring of copper onsite and by unskilled personnel.

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The Emergence of Reversible–Deactivation Radical Polymerization in 3D Printing

Bobrin

Zhang

Corrigan

et al. 2022

Adv Materials Technologies

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In particular, vat photopolymerization-based 3D printing techniques, such as digital light processing (DLP) [6] and stereolithography (SLA), [1b] have been widely applied. [7] These photoinduced techniques use light to selectively cure a liquid resin in a vat to form solid materials. Despite significant advances in polymer chemistry, [8] DLP and SLA techniques typically employ uncontrolled photopolymerization methods, that is, conventional free-radical or cationic photopolymerizations. [9] Although these techniques exhibit fast polymerization rates, making them attractive for the rapid construction of 3D objects, they have very limited control at the macromolecular level over polymer chain growth processes. [10]

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Dual-Mode Fluorescence and Visual Fluorescent Test Paper Detection of Copper Ions and EDTA

Cited by 22 publications

References 35 publications

Ultrafast Visible-Light-Induced ATRP in Aqueous Media with Carbon Quantum Dots as the Catalyst and Its Application for 3D Printing

Ultrafast Visible-Light-Induced ATRP in Aqueous Media with Carbon Quantum Dots as the Catalyst and Its Application for 3D Printing

Tuning the Sensing Properties of N and S Co-Doped Carbon Dots for Colorimetric Detection of Copper and Cobalt in Water

The Emergence of Reversible–Deactivation Radical Polymerization in 3D Printing

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