Hydrothermal synthesis of N-doped carbon quantum dots and their application in ion-detection and cell-imaging

Shen, Tong-Yang; Jia, Peiyun; Chen, Dashu; Wang, Lina

doi:10.1016/j.saa.2020.119282

Cited by 66 publications

(19 citation statements)

References 86 publications

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“…The presence of elements and their corresponding oxidation states of the optimal mass dispersoid 75 mg GQD at MnAP are confirmed from XPS studies (Figures 4 and S1) as follows. The spectrum related to C 1s states (Figure 4A) corresponds to CC, COH, and C═O bondings related to their binding energies (BE) 283, 285( sp 2 hybridized carbons), and 287 eV 54,55 . The principal satellites 2p 3/2 and 2p 1/2 of Mn (Figure 4B) have their BEs 641 and 652 eV, and their sub‐satellites are at 645 and 655 eV 38 .…”

Section: Resultsmentioning

confidence: 99%

“…The spectrum related to C 1s states (Figure 4A) corresponds to C C, C OH, and C═O bondings related to their binding energies (BE) 283, 285(sp 2 hybridized carbons), and 287 eV. 54,55 The principal satellites 2p 3/2 and 2p 1/2 of Mn (Figure 4B) have their BEs 641 and 652 eV, and their sub-satellites are at 645 and 655 eV. 38 The N 1s emission spectrum (Figure 4C) accounts for the quaternary NH 4…”

Section: Xps Studiesmentioning

confidence: 99%

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Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Raja

Vickraman

2022

Intl J of Energy Research

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The hybrid electrodes MnAP@GQD x are synthesized through microwave route for four graphene quantum dots (GQD) variates (x = 25, 50, 75, and 100 mg). The Debye-Scherrer calculations show lower crystallite size for MnAP at 75 mg GQD. In Raman studies, among all GQD variates the 75 mg GQD doped MnAP composite reveal higher I D /I G ratio (1.03). The electrochemical performance shows higher specific capacitance 596 Fg À1 at 1 Ag À1 for it. Thus, XRD, Raman, and CV studies identified 75 mg GQD as the appropriate mass dispersoid for MnAP lattice. This optimized MnAP at 75 mg GQD has been subjected to scanning electron microscopy (SEM), transmission electron microscopy (TEM), brunauer-emmet-teller (BET), and X-ray Photoelectron Spectroscopy (XPS). The SEM shows broken rectangular micro platelets for MnAP, and its disintegration after doping GQD x¼75 mg shows strong complexation. The BET study reveals mesoporosity (3 nm) favoring for better ionic transport, and the XPS accounts for the oxidation states. In full-cell, MnAP@GQD x¼75 mg as a positrode // rGO negatrode, has shown 442 Fg À1 at 1 Ag À1 in 3M H 2 SO 4 at 0-1.8 V. Further enhancement 693 Fg À1 in it, is achieved by dispersing dual redox additives 0.025M (KI/VOSO 4 ) in 3M H 2 SO 4 with 311 Wh kg À1 /450 W kg À1 at 1 Ag À1 and having the capacity retention 82% for 5000 cycles at 20 Ag À1 . Thus, increase in specific capacitance for this optimized electrode is observed for dual redox additives in 3M H 2 SO 4 suggestive for high-performance supercapattery applications.

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Section: Resultsmentioning

confidence: 99%

Section: Xps Studiesmentioning

confidence: 99%

Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Raja

Vickraman

2022

Intl J of Energy Research

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“…Since their discovery, the efficient preparation of CDs and improving their QY has remained topical. Current CDs synthesis methods can be divided into top-down [ 3 , 25 , 33 , 34 , 35 , 36 , 37 ] and bottom-up [ 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 ], as summarized in Figure 2 .…”

Section: Cds Preparation Methodsmentioning

confidence: 99%

Halogen-Doped Carbon Dots: Synthesis, Application, and Prospects

Wen

2022

Molecules

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Carbon dots (CDs) have many advantages, such as tunable photoluminescence, large two-photon absorption cross-sections, easy functionalization, low toxicity, chemical inertness, good dispersion, and biocompatibility. Halogen doping further improves the optical and physicochemical properties of CDs, extending their applications in fluorescence sensors, biomedicine, photocatalysis, anti-counterfeiting encryption, and light-emitting diodes. This review briefly describes the preparation of CDs via the “top-down” and “bottom-up” approaches and discusses the preparation methods and applications of halogen (fluorine, chlorine, bromine, and iodine)-doped CDs. The main challenges of CDs in the future are the elucidation of the luminescence mechanism, fine doping with elements (proportion, position, etc.), and their incorporation in practical devices.

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“…The obtained samples demonstrated a high quantum yield of 11.9% and low limit detection of 3.3 nM, and they were used as an electrochemical sensing probe for the determination of Hg 2+ ions in model systems as well as in the real water samples. Although the electrochemical procedures showed a lot of advantages in efficiently obtaining CQDs with high yield and low-cost production, the tedious purification of the final products could be considered the main disadvantage of this method [31,32].…”

Section: "Top-down" Approachmentioning

confidence: 99%

An Overview of the Recent Developments in Carbon Quantum Dots—Promising Nanomaterials for Metal Ion Detection and (Bio)Molecule Sensing

et al. 2021

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The fluorescent carbon quantum dots (CQDs) represent an emerging subset of carbonaceous nanomaterials, recently becoming a powerful tool for biosensing, bioimaging, and drug and gene delivery. In general, carbon dots are defined as zero-dimensional (0D), spherical-like nanoparticles with <10 nm in size. Their unique chemical, optical, and electronic properties make CQDs versatile materials for a wide spectrum of applications, mainly for the sensing and biomedical purposes. Due to their good biocompatibility, water solubility, and relatively facile modification, these novel materials have attracted tremendous interest in recent years, which is especially important for nanotechnology and nanoscience expertise. The preparation of the biomass-derived CQDs has attracted growing interest recently due to their low-cost, renewable, and green biomass resources, presenting also the variability of possible modification for the enhancement of CQDs’ properties. This review is primarily focused on the recent developments in carbon dots and their application in the sensing of different chemical species within the last five years. Furthermore, special emphasis has been made regarding the green approaches for obtaining CQDs and nanomaterial characterization toward better understanding the mechanisms of photoluminescent behavior and sensing performance. In addition, some of the challenges and future outlooks in CQDs research have been briefly outlined.

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Hydrothermal synthesis of N-doped carbon quantum dots and their application in ion-detection and cell-imaging

Cited by 66 publications

References 86 publications

Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Halogen-Doped Carbon Dots: Synthesis, Application, and Prospects

An Overview of the Recent Developments in Carbon Quantum Dots—Promising Nanomaterials for Metal Ion Detection and (Bio)Molecule Sensing

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Hydrothermal synthesis of N-doped carbon quantum dots and their application in ion-detection and cell-imaging

Cited by 66 publications

References 86 publications

Role of dual redox additivesKI/VOSO4in manganese ammonium phosphate at graphene quantum dots for supercapattery

Role of dual redox additivesKI/VOSO4in manganese ammonium phosphate at graphene quantum dots for supercapattery

Halogen-Doped Carbon Dots: Synthesis, Application, and Prospects

An Overview of the Recent Developments in Carbon Quantum Dots—Promising Nanomaterials for Metal Ion Detection and (Bio)Molecule Sensing

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Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery