Carbon dots (CDs) with 48% quantum yield (QY) were synthesized by simple hydrothermal treatment using Pseudo-stem of banana plant as carbon source. As synthesized CDs were characterized using UV–vis, fluorescence, dynamic light scattering (DLS), Fourier transform infrared (FT-IR), Raman, X-ray photoelectron spectroscopy (XPS) and High resolution transmission electron microscopic (HRTEM) techniques. A fluorescent nanosensor which exhibits highly specific recognition capability towards Fe3+ over other competing metal ions has been reported. CD exhibits fluorescent “turn-off” sensing nature with high selectivity towards Fe3+ with a detection limit as low as 6.4 nM and “turn-on” property towards S2O32− anion. The biocompatibility of CDs was revealed from the cytotoxicity studies on cancerous cells (HeLa, MCF-7 (Michigan Cancer Foundation-7)) and was employed as fluorescent probes for multi-coloured (blue, green and red) imaging of HeLa and MCF-7 cells. Due to the bright fluorescence, water solubility, high photo-stability, low toxicity, cell-membrane permeability and good biocompatibility, as-prepared carbon nanodots are demonstrated to be excellent probe as bio-imaging agent. © 2017 Elsevier B.V.

Somasundaram Anbu Anjugam Vandarkuzhali

Velu Jeyalakshmi

Konda Ramasamy Krishnamurthy

Balasubramanian Viswanathan

biocompatibility

Cytotoxicity

Dynamic light scattering

FRUITS

Metal ions

Metals

Nanosensors

Probes

X ray photoelectron spectroscopy

BANANA PLANT

Cell membrane permeability

Fluorescence imaging

Fluorescent probes

Fourier transform infrared

HYDROTHERMAL TREATMENTS

Specific recognition

Transmission electron

Fluorescence

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Sensors and Actuators, B: Chemical

Herein, the fluorescent carbon dots (CDs) with blue emission were prepared by hydrothermal treatment using pineapple peel as a source of carbon. The as-prepared CDs exhibited turn-Off fluorescence behavior toward Hg 2+ and subsequent turn-On behavior for l-cysteine along with enhanced biocompatibility and negligible cytotoxicity for cell imaging. The practical applicability of carbon dots was used for the quantification of Hg 2+ in water. On the basis of the spectral characteristic changes, we have designed individual elementary logic operations such as NOT and IMP gates, by utilizing CD as probe and Hg 2+ and l-Cys as chemical inputs. We have also demonstrated the utility of this system in electronic security devices and as memory element, with the idea of the switching. Copyright © 2018 American Chemical Society.

Fulltext

ACS Omega

Pineapple Peel-Derived Carbon Dots: Applications as Sensor, Molecular Keypad Lock, and Memory Device

In this work, we have presented a facile, efficient and green strategy to prepare fluorescence CQD for multi ion sensing and bio imaging application. Hydrothermal carbonization technique was adopted as one-pot synthetic method to prepare CQD, using Catharanthus roseus (white) leaves as carbon source without any passivating and oxidizing agent. The as-synthesized carbon hold significant advantages such as high fluorescence (FL) emission, high aqueous solubility, stability and non-toxicity etc. Fourier transform infrared spectroscopy (FTIR) and Energy-dispersive X-ray spectroscopy (EDX) confirmed CQD's surfaces enriched with oxygen and nitrogen composition. Transmission electron microscopy (TEM) revealed that average of size of CQD was around 5 nm. The maximum quantum yield of as prepared CQD was 28.2% at excitation wavelength of 330 nm. The influence of different pH affecting on fluorescence behavior of CQD was systematically studied. In multi ions sensing, FL enhancement and quenching was identified as dual FL responsive mechanism in selective and sensitive detection of Al3+ (Linear range (LR) = 0–6 μM and Limit of Detection (LOD) = 0.5 μM) and Fe3+ (Linear range (LR) = 0–6 μM and Limit of Detection (LOD) = 0.3 μM) ions, respectively. Additionally, CQD exhibited its antioxidant activity and its potential to be used in bio imaging against MCF-7 cells. MTT assay showed good biocompatibility results. Finally, the proposed Catharanthus roseus (white) leaves derived CQD may exhibit great promise as sensing probe for cancer diagnosis and treatment and also multi- ions (Al3+ and Fe3+) in field of environmental water analysis. © 2019 Elsevier B.V.

Sustainable Materials and Technologies

A sustainable synthesis of green carbon quantum dot (CQD) from Catharanthus roseus (white flowering plant) leaves and investigation of its dual fluorescence responsive behavior in multi-ion detection and biological applications

In this work, a simple, green and cost-effective fluorescence based analytical procedure using water soluble carbon nanoparticles (CNPs) is described for selective and sensitive detection of Iron (III) (i.e. ferric (Fe3+)) ions in water. The CNPs were synthesized by acid treatment of naturally occurring d-glucose followed by heating at 80 °C. The fluorescence intensity of the CNPs (excited at 360 nm) was found to decrease with the increase in concentration of Fe3+ ions. The fluorescence lifetime of CNPs remained unchanged with increasing Fe3+ concentration, suggesting the quenching to be static. The zeta potential which was negative for CNPs became positive on addition of Fe3+, thus indicating the adsorption of Fe3+ on CNPs surface. The sensing of Fe3+ by CNPs was also observed in-vivo using DLD cells. The limit of quantification and limit of detection of Fe3+ ions were found to be 18 ppm and as 56.0 ppb, respectively. Validation of the proposed fluorescence quenching based technique was achieved by comparing with Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). © 2015 Elsevier B.V. All rights reserved.

Green and cost-effective fluorescent carbon nanoparticles for the selective and sensitive detection of iron (III) ions in aqueous solution: Mechanistic insights and cell line imaging studies

White light emission was produced upon 380 nm photoexcitation from a mixture of pomegranate extract and carbon nanoparticles made from the extract in aqueous acidic (pH 1.2) solution as well as in polyvinyl alcohol polymeric film with good Commission Internationale del'Eclairage (CIE) index values (0.28, 0.33) and (0.33, 0.29) respectively. The fluorescent carbon nanoparticles were prepared by hydrothermal treatment of pomegranate extract in a very simple, green and cost-effective way. © The Royal Society of Chemistry 2016.

Journal of Materials Chemistry C

White light emission from a mixture of pomegranate extract and carbon nanoparticles obtained from the extract

Bioinformation

Computational studies on Begomoviral AC2/C2 proteins

Journal of Advances in Nanomaterials

Shape Controlled Palladium Nano Particles for Hydrogenation of Cinnamaldehyde

Sensors and Actuators B: Chemical

Green synthesis of carbon dots from rose-heart radish and application for Fe3+ detection and cell imaging

Highly fluorescent carbon dots from Pseudo-stem of banana plant: Applications as nanosensor and bio-imaging agents

Journal	Data powered by TypesetSensors and Actuators, B: Chemical
Publisher	Data powered by TypesetElsevier B.V.
ISSN	09254005
Open Access	No