Carbon Dot-Lanthanide Composite Based Smart Luminescent Anticounterfeiting Material

In this emerging technology world, the counterfeit of products are increasing due to raising the economy of industry. Counterfeiting is as old as the human desire to create objects of value. There are number of products, which can be easily duplicated by simple processes and the product is accurate and precise. Counterfeit is a problem of product security, the rise and affects every product category from consumer goods to medicines and spare parts. Products can furthermore contain non-active or even toxic- ingredients. So, luminescent materials are useful to detect different counterfeit products at different wavelength. The carbon dots-lanthanide composite based gel formulation is used to coat on different subtract and according to the process their different characterization part for the prevention of counterfeit problems. Carbon dots-lanthanide composites are basically easy to synthesis and they have fluorescent property, which can help to make product unique and diverse. With help of UV chamber, the carbon dots-lanthanide composites are easily detected at some particular wavelength. So by using this property, the gel formulation can be fabricated to coat on different subtract and characterize different surface morphology for the future precepts. UV-Vis- spectrophotometer was utilized to differentiate optical properties and fluorospectrometer was exploited to differentiate fluorescent properties of carbon dots, carbon dots-lanthanide composite and CDs-lanthanide based fluorescent ink. FT-IR and viscometer were used characterized other properties of carbon dots-lanthanide based fluorescent ink. This research article is the revised article of one step synthesis of carbon dots based smart fluorescent security ink.

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One-Step Synthesis of the Nitrogen and Sulfur Codoped Carbon Dots for Detection of Lead and Copper Ions in Aqueous Solution

Journal of Sensors ◽

10.1155/2020/8828456 ◽

2020 ◽

Vol 2020 ◽

pp. 1-8

Author(s):

Hui Gao ◽

Yuqian Pang ◽

Lei Li ◽

Chun Zhu ◽

Chaoqun Ma ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Carbon Dots ◽

Copper Ions ◽

Size Distributions ◽

Colorimetric Sensing ◽

Emission Activity ◽

One Step ◽

Ft Ir ◽

The Fourier Transform ◽

Metal Ions Detection

Herein, by using the green and cheap L-cysteine as the precursor, nitrogen and sulfur codoped carbon dots (NS-CDs) were synthesized via a facile one-step hydrothermal method. The obtained NS-CDs showed the relatively narrow size distributions (2.1~3.9 nm) with the lattice spacing of 0.29 nm, as well as the excitation-dependent photoluminescence (PL) emission activity with the quantum yield (QY) of 18%. More interestingly, the PL intensity of NS-CDs was quenched by the addition of copper or lead ions (Cu2+ or Pb2+), which was shown in the tradition detection method by PL spectra. The NS-CDs exhibited ultrasensitive colorimetric sensing capability for both Cu2+ and Pb2+ by the color variance using naked eyes without any further treating. Two different coupling ways for detecting Pb2+ and Cu2+ were induced by the analysis of the Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). And the as-prepared NS-CDs showed their potential application in the heavy metal ions detection for the wastewater determination.

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One Step Chemical Synthesis of Carbon Dot Based Smart Fluorescent Security Ink

Volume 5 - 2020, Issue 9 - September - International Journal of Innovative Science and Research Technology ◽

10.38124/ijisrt20sep237 ◽

2020 ◽

Vol 5 (9) ◽

pp. 219-222 ◽

Cited By ~ 1

Author(s):

Jyoti Sharma ◽

Pranav Y. Dave

Keyword(s):

Optical Properties ◽

Chemical Synthesis ◽

Structural Properties ◽

Carbon Dots ◽

Food Products ◽

Synthesis Process ◽

Fluorescent Properties ◽

Electronic Products ◽

Carbon Dot ◽

One Step

In the recent world, there are number of problems related to counterfeit of the different products. There are number of products, which can be easily duplicated by simple processes and the product is accurate and precise. Even the counterfeit of currency is also a main problem in world’s economic. There are number of sectors, which can be effected due to this reason like duplication of electronic products, duplication of food products, duplication of automobile products, duplication of currency, etc. So there are number of anti-counterfeiting technologies available in the market to prevent counterfeit problems. In this paper, it explains to prevent this type of problems with the help of carbon dot based gel formulation, which can be used in different ways. This paper describes the synthesis process and characterization analysis of carbon dot based smart fluorescent security ink to prevent the counterfeit problems. UV-Visspectrophotometer was utilized to differentiate optical properties and fluoroscpectometer was exploited to differentiate fluorescent properties of carbon dots and carbon dot based fluorescent ink. AFM and FTIR were used to analysis the structural properties of carbon dots and carbon dot based fluorescent ink

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The sonochemical synthesis of Ga@C-dots particles

RSC Advances ◽

10.1039/c5ra01101a ◽

2015 ◽

Vol 5 (32) ◽

pp. 25533-25540 ◽

Cited By ~ 26

Author(s):

Vijay Bhooshan Kumar ◽

Ilana Perelshtein ◽

Anat Lipovsky ◽

Ze’ev Porat ◽

Aharon Gedanken

Keyword(s):

Carbon Dots ◽

Sonochemical Synthesis ◽

Research Article ◽

One Step

This research article is focused on a one-step sonochemical fabrication of carbon dots doped with Ga atom.

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Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities

Nanomaterials ◽

10.3390/nano11020369 ◽

2021 ◽

Vol 11 (2) ◽

pp. 369 ◽

Cited By ~ 1

Author(s):

Arumugam Saravanan ◽

Moorthy Maruthapandi ◽

Poushali Das ◽

John H. T. Luong ◽

Aharon Gedanken

Keyword(s):

Carbon Dots ◽

Fluorescence Spectra ◽

Antibacterial Effect ◽

Curcuma Longa ◽

Antibacterial Activities ◽

Blue Color ◽

Mean Size ◽

One Step ◽

Bactericidal Activities ◽

Bright Blue

Carbon dots (CDs) were obtained from medicinal turmeric leaves (Curcuma longa) by a facile one-step hydrothermal method and evaluated for their bactericidal activities against two gram-negative; Escherichia coli, Klebsiella pneumoniae, and two gram-positive counterparts; Staphylococcus aureus, S. epidermidis. The CDs exhibited spherical shapes with a mean size of 2.6 nm. The fluorescence spectra of CDs revealed intense fluorescence at λex/em = 362/429 nm with a bright blue color in an aqueous solution. The CDs showed strong photostability under various environmental conditions (pH, salt, and UV-radiation). The complete bactericidal potency of CDs was 0.25 mg/mL for E.coli and S. aureus after 8 h of exposure, while for K. pneumoniae, and S. epidermidis, the CDs at 0.5 mg/mL good antibacterial effect within 8 h and complete eradication after 24 h of exposure is observed. The release of reactive oxygen species played a crucial role in the death of the bacterial cell. The present study provides a strategy for the preparation of CDs from a medicinal plant and their potential antibacterial activities against four common contagious pathogens.

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Self-Targeting of Carbon Dots into the Cell Nucleus: Diverse Mechanisms of Toxicity in NIH/3T3 and L929 Cells

International Journal of Molecular Sciences ◽

10.3390/ijms22115608 ◽

2021 ◽

Vol 22 (11) ◽

pp. 5608

Author(s):

Markéta Havrdová ◽

Iztok Urbančič ◽

Kateřina Bartoň Tománková ◽

Lukáš Malina ◽

Janez Štrancar ◽

...

Keyword(s):

Dna Damage ◽

Carbon Dots ◽

L929 Cell ◽

Fluorescent Properties ◽

Cell Cycle Profile ◽

Mechanisms Of Toxicity ◽

3T3 Fibroblasts ◽

Nih 3T3 ◽

Positively Charged ◽

Endocytic Pathways

It is important to understand the nanomaterials intracellular trafficking and distribution and investigate their targeting into the nuclear area in the living cells. In our previous study, we firstly observed penetration of nonmodified positively charged carbon dots decorated with quaternary ammonium groups (QCDs) into the nucleus of mouse NIH/3T3 fibroblasts. Thus, in this work, we focused on deeper study of QCDs distribution inside two healthy mouse NIH/3T3 and L929 cell lines by fluorescence microspectroscopy and performed a comprehensive cytotoxic and DNA damage measurements. Real-time penetration of QCDs across the plasma cell membrane was recorded, concentration dependent uptake was determined and endocytic pathways were characterized. We found out that the QCDs concentration of 200 µg/mL is close to saturation and subsequently, NIH/3T3 had a different cell cycle profile, however, no significant changes in viability (not even in the case with QCDs in the nuclei) and DNA damage. In the case of L929, the presence of QCDs in the nucleus evoked a cellular death. Intranuclear environment of NIH/3T3 cells affected fluorescent properties of QCDs and evoked fluorescence blue shifts. Studying the intracellular interactions with CDs is essential for development of future applications such as DNA sensing, because CDs as DNA probes have not yet been developed.

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Hydrothermal Synthesis of Sodalite-Type N-A-S-H from Fly Ash to Remove Ammonium and Phosphorus from Water

Materials ◽

10.3390/ma14112741 ◽

2021 ◽

Vol 14 (11) ◽

pp. 2741

Author(s):

Pengcheng Lv ◽

Ruihong Meng ◽

Zhongyang Mao ◽

Min Deng

Keyword(s):

Fly Ash ◽

Adsorption Capacity ◽

Removal Rate ◽

Kinetic Studies ◽

Solute Concentration ◽

Raw Material ◽

Sodium Aluminosilicate ◽

Equilibrium Data ◽

One Step ◽

Ft Ir

In this study, the hydrated sodium aluminosilicate material was synthesized by one-step hydrothermal alkaline desilication using fly ash (FA) as raw material. The synthesized materials were characterized by XRD, XRF, FT-IR and SEM. The characterization results showed that the alkali-soluble desilication successfully had synthesized the sodium aluminosilicate crystalline (N-A-S-H) phase of sodalite-type (SOD), and the modified material had good ionic affinity and adsorption capacity. In order to figure out the suitability of SOD as an adsorbent for the removal of ammonium and phosphorus from wastewater, the effects of material dosing, contact time, ambient pH and initial solute concentration on the simultaneous removal of ammonium and phosphorus are investigated by intermittent adsorption tests. Under the optimal adsorption conditions, the removal rate of ammonium was 73.3%, the removal rate of phosphate was 85.8% and the unit adsorption capacity reached 9.15 mg/L and 2.14 mg/L, respectively. Adsorption kinetic studies showed that the adsorption of ammonium and phosphorus by SOD was consistent with a quasi-secondary kinetic model. The adsorption isotherm analysis showed that the equilibrium data were in good agreement with the Langmuir and Freundlich model. According to thermodynamic calculations, the adsorption of ammonium and phosphorus was found to be a heat-absorbing and spontaneous process. Therefore, the preparation of SOD by modified FA has good adsorption properties as adsorbent and has excellent potential for application in the removal of contaminants from wastewater.

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Sustainability of Recycling Waste Picker Sustainopreneurs for Prevention and Mitigation of Municipal Solid Waste in Swat

Sustainability ◽

10.3390/su13126533 ◽

2021 ◽

Vol 13 (12) ◽

pp. 6533

Author(s):

Muhammad Nawaz ◽

Muhammad Tariq Yousafzai ◽

Tariq Shah ◽

Chunlin Xin ◽

Wisal Ahmad

Keyword(s):

Spare Parts ◽

Tax Amnesty ◽

Self Organized ◽

Metal Recycling ◽

Business Creation ◽

Inductive Research ◽

Waste Energy ◽

Alternative Sources ◽

Tax Holidays ◽

Counterfeit Products

This study assessed the role of waste picker sustainopreneurs (WPS) by examining their recycling contributions in a special case of District Swat, Pakistan. Using a transformative worldview, this study acknowledges their contributions to recycling. The study envisages how entrepreneurial agency works in unanticipated ways where the poorest of the poor enterprise without resources demonstrate unexpected agency to improve the environment. An inductive research design in conjunction with grounded theory was used to analyze data from 37 interviews in three tehsils of District Swat. The recycling sector uses primitive measures, which are completely informal, self-organized, and self-controlled. Surprisingly, we discovered that informal recycling contributes unfavorably to waste, energy, and food (WEF) security due to intermixing and adulteration, as well as acts as a gray channel for illicit practices that have taken advantage of tax amnesty in the area until 2023. The uncontrolled welding of half cut and nose cut car parts has skyrocketed the motorization index and CO2 emissions; however, it has also resulted in alternative sources of livelihoods, as these accidental environmentalists had found modern sources of income. This is similar to low-tech innovation and business creation that takes advantage of tax holidays due to the special status of District Swat. The study highlights the most and least valuable recyclables and identifies the gray channel markets of spare parts, metal recycling, counterfeit products, fuel intermixing, and adulteration. The study contributes by untangling the understanding of a legal gambit of tax amnesty at a critical pre-policy input as well as advocates for rights of invisible stakeholders of waste management in Pakistan.

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Fast one-step synthesis of N-doped carbon dots by pyrolyzing ethanolamine

Journal of Materials Chemistry C ◽

10.1039/c4tc01139b ◽

2014 ◽

Vol 2 (36) ◽

pp. 7477-7481 ◽

Cited By ~ 99

Author(s):

Xinwei Dong ◽

Yanjie Su ◽

Huijuan Geng ◽

Zhongli Li ◽

Chao Yang ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Carbon Dots ◽

High Yield ◽

One Step ◽

Doped Carbon Dots

N-doped CDs can be obtained directly with high yield by pyrolyzing ethanolamine in air within just 7 minutes with the assistance of hydrogen peroxide.

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One Step Synthesis and Characterization of Zirconia-Graphene Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.600.174 ◽

2012 ◽

Vol 600 ◽

pp. 174-177 ◽

Cited By ~ 1

Author(s):

Jian Fei Xia ◽

Zong Hua Wang ◽

Yan Zhi Xia ◽

Fei Fei Zhang ◽

Fu Qiang Zhu ◽

...

Keyword(s):

Synthesis And Characterization ◽

Two Dimensional ◽

X Ray Diffraction ◽

X Ray ◽

Graphene Composite ◽

Transmission Electron ◽

One Step ◽

Ft Ir ◽

Xrd Techniques

Zirconia-graphene composite (ZrO2-G) has been successfully synthesized via decomposition of ZrOCl2•6H2O in a water-isopropanol system with dispersed graphene oxide (GO) utilizing Na2S as a precursor could enable the occurrence of the deposition of Zr4+ and the deoxygenation of GO at the same time. Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) techniques were used to characterize the samples. It was found that graphene were fully coated with ZrO2, and the ZrO2 existing in tetragonal phase, which resulted in the formation of two-dimensional composite.

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