Effect of carbonaceous oil palm leaf quantum dot dispersion in nematic liquid crystal on zeta potential, optical texture and dielectric properties

Rastogi, Ayushi; Pandey, Fanindra Pati; Parmar, Avanish Singh; Singh, Shri; Hegde, Gurumurthy; Manohar, Rajiv

doi:10.1007/s40097-020-00382-6

Cited by 25 publications

(12 citation statements)

References 25 publications

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“…By discovering carbon-nano dots in the last decade, Xu et al [6] have introduced the novel fluorescent nanomaterials that have been widely used in the various research field such as in chemical sensing [10,[12][13][14][15], biology [16], nanomedicine [17,18], and photocatalysis [19]. This research group in 2004 isolated novel nanomaterial during the electrophoretic purification process of single-walled carbon nanotubes (SWCNTs) by the arc-discharge technique [6].…”

Section: Methods For Preparation Of Carbon Quantum Dotsmentioning

confidence: 99%

“…The higher flexibility of the "bottom-up" approach by the means of the selection of chemical precursors and applying optimal operating conditions makes "bottom-up" methods more favorable techniques for obtaining different CQDs. Thermal/combustion techniques are the most commonly reported synthetic routes for CQDs preparation due to their simplicity, better variability of using different carbon sources, surface functionalization, environmental friendliness, and lower costs of synthesis [5,12,33]. Another important advantage of the "bottom-up" approach is better control over the particle size, morphology, and chemical composition.…”

Section: "Bottom-up" Approachmentioning

confidence: 99%

“…It is well-known that the synthesis of transition metal quantum dots (such as cadmium selenide (CdSe), cadmium telluride (CdTe), cadmium sulfide (CdS), etc.) exhibits good performance in the terms of stability and optical characteristics; however high synthetic costs and low biocompatibility has limited their application in biomedicine, more precisely in theranostic purposes [12]. Therefore, biomass has emerged as a potential carbon source and sustainable material for obtaining non-toxic and highly efficient CQDs.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methods For Preparation Of Carbon Quantum Dotsmentioning

confidence: 99%

Section: "Bottom-up" Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…LCs exhibit interesting dielectric, optical and spectroscopic properties that explain their wide variety of applications. Among the different phases in LCs, the nematic phase is the simplest one and has very interesting advantages in the fields of both display and non-display electronic devices [ 157 ]. In addition, the dispersion of NMs, namely QDs, in nematic LCs (NLCs) has gained importance due to the improvement in the properties that QDs dispersion impairs NLCs [ 158 ].…”

Section: Surface Chemistry Of Qdsmentioning

confidence: 99%

“…In addition, the dispersion of NMs, namely QDs, in nematic LCs (NLCs) has gained importance due to the improvement in the properties that QDs dispersion impairs NLCs [ 158 ]. Likewise, in the previous paragraph, the study of the stability and aggregation of pristine and QD-dispersed NLCs was carried out by ζ potential and spectrometric (UV–Vis and fluorescence) measurements, when dispersing CQDs in 4′-heptyl-4-biphenylcarbonitrile [ 158 ], and when oil palm leaf-based carbonaceous QDs (OPL QDs) were dispersed in the commercial nematic mixture E48, a positive (+ve) dielectric anisotropic material with the phase sequence Cr.–19 °C–N–100 °C–Iso was observed [ 157 ].…”

Section: Surface Chemistry Of Qdsmentioning

confidence: 99%

Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

et al. 2022

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Since the discovery of Quantum Dots (QDs) by Alexey I. Ekimov in 1981, the interest of researchers in that particular type of nanomaterials (NMs) with unique optical and electrical properties has been increasing year by year. Thus, since 2009, the number of scientific articles published on this topic has not been less than a thousand a year. The increasing use of QDs due to their biomedical, pharmaceutical, biological, photovoltaics or computing applications, as well as many other high-tech uses such as for displays and solid-state lighting (SSL), has given rise to a considerable number of studies about its potential toxicity. However, there are a really low number of reported studies on the detection and quantification of QDs, and these include ICP–MS and electrochemical analysis, which are the most common quantification techniques employed for this purpose. The knowledge of chemical phenomena occurring on the surface of QDs is crucial for understanding the interactions of QDs with species dissolved in the dispersion medium, while it paves the way for a widespread use of chemosensors to facilitate its detection. Keeping in mind both human health and environmental risks of QDs as well as the scarcity of analytical techniques and methodological approaches for their detection, the adaptation of existing techniques and methods used with other NMs appears necessary. In order to provide a multidisciplinary perspective on QD detection, this review focused on three interrelated key aspects of QDs: properties, surface chemistry and detection.

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Enhancing porous electrodes through carbon activation of palm shell with gel activating agent

Kandasamy,

Ramyea,

Tharani

et al. 2024

Polym. Bull.

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Effect of carbonaceous oil palm leaf quantum dot dispersion in nematic liquid crystal on zeta potential, optical texture and dielectric properties

Cited by 25 publications

References 25 publications

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

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

Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

Enhancing porous electrodes through carbon activation of palm shell with gel activating agent

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