A novel fluorescent Si/CDs for highly sensitive Hg2+ sensing in water environment
29 Nov 2021-Colloids and Surfaces A: Physicochemical and Engineering Aspects (Elsevier BV)-pp 128023
TL;DR: A blue fluorescent Si/CDs was successfully synthesized via a conventional solvothermal method, which can serve as a sensitive fluorescent sensor to detect Hg2+ ions in water as discussed by the authors.
About: This article is published in Colloids and Surfaces A: Physicochemical and Engineering Aspects.The article was published on 2021-11-29 and is currently open access. It has received 4 citations till now. The article focuses on the topics: Fluorescence & Tap water.
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TL;DR: In this paper , a review of the recent advances in carbon dots (CDs) can be found, where the authors illustrate some examples to correlate process parameters, structures, compositions, properties, and performances of CDs.
Abstract: Although there is significant progress in the research of carbon dots (CDs), some challenges such as difficulty in large-scale synthesis, complicated purification, low quantum yield, ambiguity in structure-property correlation, electronic structures, and photophysics are still major obstacles that hinder the commercial use of CDs. Recent advances in synthesis, modification, characterization, and applications of CDs are summarized in this review. We illustrate some examples to correlate process parameters, structures, compositions, properties, and performances of CDs-based materials. The advances in the synthesis approach, purification methods, and modification/doping methods for the synthesis of CDs are also presented. Moreover, some examples of the kilogram-scale fabrication of CDs are given. The properties and performance of CDs can be tuned by some synthesis parameters, such as the incubation time and precursor ratio, the laser pulse width, and the average molar mass of the polymeric precursor. Surface passivation also has a significant influence on the particle sizes of CDs. Moreover, some factors affect the properties and performance of CDs, such as the polarity-sensitive fluorescence effect and concentration-dependent multicolor luminescence, together with the size and surface states of CDs. The synchrotron near-edge X-ray absorption fine structure (NEXAFS) test has been proved to be a useful tool to explore the correlation among structural features, photophysics, and emission performance of CDs. Recent advances of CDs in bioimaging, sensing, therapy, energy, fertilizer, separation, security authentication, food packing, flame retardant, and co-catalyst for environmental remediation applications were reviewed in this article. Furthermore, the roles of CDs, doped CDs, and their composites in these applications were also demonstrated.
13 citations
TL;DR: In this article , a review of recent research and developments on CQD-based sensors that can be used in the food industry is presented, which outlines the potential challenges and prospects of modern CQDs and real-time intelligent sensing of food quality changes.
Abstract: Carbon quantum dots (CQDs) are widely used in various industries due to their non-toxic, biocompatibility, antibacterial, and tunable photoluminescence properties. In particular, interest in developing smart/intelligent sensing systems using CQDs is increasing in the food industry. The integration of CQDs-sensing platforms with food packaging could provide a means to allow real-time monitoring of the quality change of packaged foods. A novel fluorescent carbon nanomaterial, CQD, is considered a promising candidate for developing novel intelligent nanosensors for food quality control. Therefore, it is noteworthy to analyze new information on the proficiency of CQD-based sensing systems in developing sustainable, innovative packaging materials. Although CQDs have been used for several potential applications, the focus of the current review is to summarize recent research and developments on CQD-based sensors that can be used in the food industry. This review also outlines the potential challenges and prospects of modern CQDs and real-time intelligent sensing of food quality changes.
12 citations
TL;DR: In this paper , a carbon quantum dot (CQD) was synthesized using waste bike pollutant soot and the resulting CQDs were used for electrical humidity sensing.
Abstract: Humidity sensor-based carbon quantum dots (CQDs) have been prepared using waste bike pollutant soot. The synthesized CQDs were characterized using a UV–Visible light chamber, UV–Visible spectroscopy , photoluminescence spectroscopy, TEM, and FTIR research. Initially, the sample was exposed in a closed chamber to UV–Visible light, which produced green luminescence. The photo luminescent spectrometer revealed the emission of green spectra as well as the approximate size of the CQDs. TEM and HRTEM confirmed the spherical shaped particles ∼2 nm in size. The FTIR spectra indicated the existence of a functional group. The sensing element was fabricated using the spin coating method on a borosilicate substrate and was used as a humidity sensor. Carbon quantum dots have excellent humidity sensing properties, as evidenced by measurements of sensitivity, ageing effect, repeatability, reaction, and recovery times. Many humidity sensors based on metal oxides, semiconductors, and polymers have been investigated and developed. The novelty of the work, electrical humidity sensor has been proposed using the waste pollutant soot. • The sustainable, cost effective and rapid synthesis of pollutant bike soot carbon quantum dot. • The prepared were imperiled for electrical humidity sensing. • The first, second, third and fourth layers of sensing characteristics are reported. • The beauty of the experiment is that the electrical humidity sensor is proposed to design by using the waste pollutant soot.
11 citations
References
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TL;DR: It is reported that nanoscale carbon particles (carbon dots) upon simple surface passivation are strongly photoluminescent in both solution and the solid state.
Abstract: We report that nanoscale carbon particles (carbon dots) upon simple surface passivation are strongly photoluminescent in both solution and the solid state. The luminescence emission of the carbon dots is stable against photobleaching, and there is no blinking effect. These strongly emissive carbon dots may find applications similar to or beyond those of their widely pursued silicon counterparts.
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TL;DR: Arc-synthesized single-walled carbon nanotubes have been purified through preparative electrophoresis in agarose gel and glass bead matrixes and promise to be interesting nanomaterials in their own right.
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3,357 citations
TL;DR: Highly photoluminescent carbon dots with a PL quantum yield of 26% have been prepared in one step by hydrothermal treatment of orange juice and demonstrated as excellent probes in cellular imaging.
1,314 citations
TL;DR: It is proposed that tetrabutyl ammonium (TBA) cations most probably intercalate into the gaps and the defects during electrochemical cycling and break the tubes near the defects.
Abstract: Blue luminescent nanocrystals (NCs) were prepared electrochemically from multiwalled carbon nanotubes (MWCNTs) for the first time. The carbon NCs were characterized by UV−vis, photoluminescence, Raman, XRD spectroscopy, and high-resolution transmission electron microscopy. The structure evolution of the MWCNTs during electrochemical treatments was monitored by SEM ex situ. Since the MWCNTs were formed with scrolled graphene layers, we propose that tetrabutyl ammonium (TBA) cations most probably intercalate into the gaps and the defects during electrochemical cycling and break the tubes near the defects.
1,055 citations
TL;DR: A simple, economical, and green preparative strategy toward water-soluble, fluorescent carbon nanoparticles (CPs) with a quantum yield of approximately 6.9% by hydrothermal process using low cost wastes of pomelo peel as a carbon source for the first time is reported.
Abstract: The present article reports on a simple, economical, and green preparative strategy toward water-soluble, fluorescent carbon nanoparticles (CPs) with a quantum yield of approximately 6.9% by hydrothermal process using low cost wastes of pomelo peel as a carbon source for the first time. We further explore the use of such CPs as probes for a fluorescent Hg2+ detection application, which is based on Hg2+-induced fluorescence quenching of CPs. This sensing system exhibits excellent sensitivity and selectivity toward Hg2+, and a detection limit as low as 0.23 nM is achieved. The practical use of this system for Hg2+ determination in lake water samples is also demonstrated successfully.
939 citations