scholarly journals Insights into the origin of the excited transitions in graphene quantum dots interacting with heavy metals in different media

2017 ◽  
Vol 19 (45) ◽  
pp. 30445-30463 ◽  
Author(s):  
Ivan Shtepliuk ◽  
Volodymyr Khranovskyy ◽  
Rositsa Yakimova
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Electrochemical Sensors ◽  
Graphene Quantum Dots ◽  
Toxic Heavy Metals ◽  
Reliable Detection

Exploring graphene quantum dots (GQDs) is an attractive way to design novel optical and electrochemical sensors for fast and reliable detection of toxic heavy metals (HMs), such as Cd, Hg and Pb.

scholarly journals On the interaction of toxic Heavy Metals (Cd, Hg, Pb) with graphene quantum dots and infinite graphene

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Ivan Shtepliuk ◽  
Nuala M. Caffrey ◽  
Tihomir Iakimov ◽  
Volodymyr Khranovskyy ◽  
Igor A. Abrikosov ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Toxic Heavy Metals

Tailoring of graphene quantum dots for toxic heavy metals detection

2019 ◽  
Vol 125 (11) ◽  
Author(s):  
Hamid Reza Ghenaatian ◽  
Mehdi Shakourian-Fard ◽  
Masoud Rohani Moghadam ◽  
Ganesh Kamath ◽  
Mohsen Rahmanian
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Toxic Heavy Metals

scholarly journals Interband transitions in closed-shell vacancy containing graphene quantum dots complexed with heavy metals

2018 ◽  
Vol 20 (33) ◽  
pp. 21528-21543 ◽  
Author(s):  
Ivan Shtepliuk ◽  
Rositsa Yakimova
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Strong Interaction ◽  
High Performance ◽  
Optical Detection ◽  
Graphene Quantum Dots ◽  
Closed Shell ◽  
Interband Transitions ◽  
Toxic Heavy Metals ◽  
Shell Vacancy

High-performance optical detection of toxic heavy metals by using graphene quantum dots (GQDs) requires a strong interaction between the metals and GQDs, which can be reached through artificial creation of vacancy-type defects in GQDs.

scholarly journals Electrochemical Sensors for the Detection of Lead and Other Toxic Heavy Metals: The Next Generation of Personal Exposure Biomonitors

2007 ◽  
Vol 115 (12) ◽  
pp. 1683-1690 ◽  
Author(s):  
Wassana Yantasee ◽  
Yuehe Lin ◽  
Kitiya Hongsirikarn ◽  
Glen E. Fryxell ◽  
Raymond Addleman ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Electrochemical Sensors ◽  
Personal Exposure ◽  
Next Generation ◽  
Toxic Heavy Metals

scholarly journals Graphene Quantum Dots-Based Nanocomposites Applied in Electrochemical Sensors: A Recent Survey

Electrochem ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 490-519
Author(s):  
Murilo H. M. Facure ◽  
Rodrigo Schneider ◽  
Jessica B. S. Lima ◽  
Luiza A. Mercante ◽  
Daniel S. Correa
Keyword(s):  
Quantum Dots ◽  
Molecularly Imprinted Polymers ◽  
Electrochemical Sensors ◽  
Graphene Quantum Dots ◽  
Electrochemical Sensing ◽  
Synthesis Methods ◽  
Current Trends ◽  
Sensing Platforms ◽  
Metal Organic ◽  
2D Nanomaterials

Graphene quantum dots (GQDs) have been widely investigated in recent years due to their outstanding physicochemical properties. Their remarkable characteristics allied to their capability of being easily synthesized and combined with other materials have allowed their use as electrochemical sensing platforms. In this work, we survey recent applications of GQDs-based nanocomposites in electrochemical sensors and biosensors. Firstly, the main characteristics and synthesis methods of GQDs are addressed. Next, the strategies generally used to obtain the GQDs nanocomposites are discussed. Emphasis is given on the applications of GQDs combined with distinct 0D, 1D, 2D nanomaterials, metal-organic frameworks (MOFs), molecularly imprinted polymers (MIPs), ionic liquids, as well as other types of materials, in varied electrochemical sensors and biosensors for detecting analytes of environmental, medical, and agricultural interest. We also discuss the current trends and challenges towards real applications of GQDs in electrochemical sensors.

scholarly journals Carbon-Based Quantum Dots for Electrochemical Detection of Monoamine Neurotransmitters—Review

Biosensors ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 162
Author(s):  
Saheed E. Elugoke ◽  
Abolanle S. Adekunle ◽  
Omolola E. Fayemi ◽  
Bhekie B. Mamba ◽  
El-Sayed M. Sherif ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electrochemical Sensors ◽  
Graphene Quantum Dots ◽  
Good Sensitivity ◽  
Health Issues ◽  
Monoamine Neurotransmitters ◽  
Good Electrocatalytic Activity ◽  
Low Cytotoxicity ◽  
Made In ◽  
Carbon Based

Imbalance in the levels of monoamine neurotransmitters have manifested in severe health issues. Electrochemical sensors have been designed for their determination, with good sensitivity recorded. Carbon-based quantum dots have proven to be an important component of electrochemical sensors due to their high conductivity, low cytotoxicity and opto-electronic properties. The quest for more sensitive electrodes with cheaper materials led to the development of electrochemical sensors based on carbon-based quantum dots for the detection of neurotransmitters. The importance of monoamine neurotransmitters (NTs) and the good electrocatalytic activity of carbon and graphene quantum dots (CQDs and GQDs) make the review of the efforts made in the design of such sensors for monoamine NTs of huge necessity. The differences and the similarities between these two quantum dots are highlighted prior to a discussion of their application in electrochemical sensors over the last ten years. Compared to other monoamine NTs, dopamine (DA) was the most studied with GQDs and CQD-based electrochemical sensors.

scholarly journals Detection of Heavy Metals in Water Using Graphene Oxide Quantum Dots: An Experimental and Theoretical Study

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5519
Author(s):  
Lorenzo Gontrani ◽  
Olivia Pulci ◽  
Marilena Carbone ◽  
Roberto Pizzoferrato ◽  
Paolo Prosposito
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Graphene Oxide ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Theoretical Study ◽  
Graphene Quantum Dots ◽  
Emission Spectra ◽  
Optical Response ◽  
Graphene Oxide Quantum Dots

In this work, we investigate by ab initio calculations and optical experiments the sensitivity of graphene quantum dots in their use as devices to measure the presence, and concentration, of heavy metals in water. We demonstrate that the quenching or enhancement in the optical response (absorption, emission) depends on the metallic ion considered. In particular, two cases of opposite behaviour are considered in detail: Cd2+, where we observe an increase in the emission optical response for increasing concentration, and Pb2+ whose emission spectra, vice versa, are quenched along the concentration rise. The experimental trends reported comply nicely with the different hydration patterns suggested by the models that are also capable of reproducing the minor quenching/enhancing effects observed in other ions. We envisage that quantum dots of graphene may be routinely used as cheap detectors to measure the degree of poisoning ions in water.

Graphene Quantum Dots in Electrochemical Sensors/Biosensors

2019 ◽  
Vol 15 (2) ◽  
pp. 103-123 ◽  
Author(s):  
Farnoush Faridbod ◽  
Afsaneh L. Sanati
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Electrochemical Properties ◽  
Edge Effects ◽  
Quantum Confinement ◽  
Electrochemical Sensors ◽  
Graphene Quantum Dots ◽  
Graphene Oxides ◽  
Reduced Graphene ◽  
Fluorescent Nanomaterials

Background: Graphene and its derivatives, as most promising carbonic nanomaterials have been widely used in design and making electrochemical sensors and biosensors. Graphene quantum dots are one of the members of this family which have been mostly known as fluorescent nanomaterials and found extensive applications due to their remarkable optical properties. Quantum confinement and edge effects in their structures also cause extraordinary electrochemical properties. Objective: Recently, graphene quantum dots besides graphene oxides and reduced graphene oxides have been applied for modification of the electrodes too and exposed notable effects in electrochemical responses. Here, we are going to consider these significant effects through reviewing some of the recent published works.

scholarly journals Detection of Heavy Metals in Water Using Graphene Quantum Dots: An Experimental and Theoretical Study

2021 ◽  
Author(s):  
Lorenzo Gontrani ◽  
Olivia Pulci ◽  
Marilena Carbone ◽  
Roberto Pizzoferrato ◽  
Paolo Prosposito
Keyword(s):  
Heavy Metals ◽  
Quantum Dots ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Theoretical Study ◽  
Graphene Quantum Dots ◽  
Emission Spectra ◽  
Optical Response ◽  
Test Cases

In this work, we investigate by ab initio calculations and optical experiments the sensitiv- ity of graphene quantum dots in their use as devices to measure the presence, and concentration, of heavy metals in water. We demonstrate that the quenching or enhancement in the optical response (absorption, emission) depends on the metallic ion considered. In particular, two test cases of opposite behaviour are considered: Cd 2+ , where we observe an increase in the optical response for increasing concentration, and Pb 2 whose emission spectra are quenched along the concentration rise. We envisage that quantum dots of graphene may be routinely used as cheap detectors to measure the degree of poisoning ions in water

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