Related Experiment Video
Updated: Feb 3, 2026

Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays
Published on: June 28, 2024
Graphene Quantum Dots Integrated in Ionophore-Based Fluorescent Nanosensors for Na+ and K.
Renjie Wang1, Xinfeng Du1, Yaotian Wu1
1Department of Chemistry , Southern University of Science and Technology , Shenzhen , 518055 , P. R. China.
Abstract:
To enrich the recipes of ion-selective nanosensors, graphene quantum dots (GQDs) were integrated into ionophore-based fluorescent nanosensors with exquisite selectivity and high sensitivity for Na+ and K+. The unique property of GQDs gave the nanosensors ultrasmall size (ca. 10 nm), high brightness, good biocompatibility, and potential pH sensing possibility. At pH 7.4, the sensors exhibited a detection range from 0.1 mM to 1 M for Na+ and from 3 μM to 1 mM for K+. The nanosensors were successfully applied to blood serum and urine samples. Chemically induced intracellular sodium concentration change in HeLa cells was also qualitatively monitored.
Related Concept Videos
Quantum Numbers
The Quantum-Mechanical Model of an Atom
Dot Product
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
Consider a vehicle pulling an object along the ground using a rope. If the rope makes an angle with the horizontal axis, the work done can be calculated using the dot product of the force applied and the object's displacement.
The dot...
The Dot Product
Dot Product: Problem Solving
Identify the problem: Start by reading the problem and...
Integration by Parts: Indefinite Integrals

