Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Quantitative analysis of ion crossover in bacterial cellulose membranes separating diffusion behaviour from membrane thickness effects.

International journal of biological macromolecules·2026

Same author

Incorporation of the Trifluoromethylthio Group (CF<sub>3</sub>S-) into Biomolecules: A Versatile Tool for Advancing Life Sciences.

The Journal of organic chemistry·2026

Same author

Highly Flexible and Conformable ZnO/FeGa Magnetoelectric Heterostructures for Skin wound Healing.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026

Same author

Continuous-flow electrochemical production of H<sub>2</sub>O<sub>2</sub> in a gas diffusion electrode microreactor.

Chemical communications (Cambridge, England)·2026

Same author

Trifluoromethylthio and Trifluoromethyl Functionalization of Endomorphin-1 Enhances its Hydrophobicity and Plasma Stability while Preserving its Affinity for the μ-Opioid Receptor.

The Journal of organic chemistry·2026

Same author

Revealing the Hidden Electrochemical Pathway for Cathode Electrolyte Interface Formation in Lithium-Sulfur Batteries with Carbonate-Based Electrolytes.

ACS applied energy materials·2026

Same journal

Turbulent flow in a vortex separator with a directed pipe inlet.

Scientific reports·2026

Same journal

Systematic characteristic evaluation of clay-based cementitious material derived from calcium carbide residue and waste tile powder.

Scientific reports·2026

Same journal

Retraction Note: Improvement of a rapid diagnostic application of monoclonal antibodies against avian influenza H7 subtype virus using Europium nanoparticles.

Scientific reports·2026

Same journal

Applying large language models to spam detection in the Kazakh low-resource language setting.

Scientific reports·2026

Same journal

An open-source 3D printing system enabling in-situ freeze-thaw processing of hydrogels.

Scientific reports·2026

Same journal

An enhanced EfficientNet framework for automated waste classification using cosine annealing and label smoothing.

Scientific reports·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Jun 18, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Tomato-derived carbon quantum dots: composition-driven structure and copper sensing potential.

Jovana Periša¹, Jan Hočevar², Bojana Milićević¹

¹Centre of Excellence for Photoconversion, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, 11351, Serbia.

Scientific Reports

|June 16, 2026

Summary

This summary is machine-generated.

Researchers created carbon quantum dots (CQDs) from tomato waste. These CQDs can detect copper ions with high sensitivity, offering a sustainable method for creating functional nanomaterials from agricultural byproducts.

Keywords:

Carbon quantum dots Luminescence Tomato biomass

More Related Videos

Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Fluorescent Lateral Flow Immunoassay Based on Quantum Dots Nanobeads

Fluorescent Lateral Flow Immunoassay Based on Quantum Dots Nanobeads

Published on: June 28, 2024

Related Experiment Videos

Last Updated: Jun 18, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Fluorescent Lateral Flow Immunoassay Based on Quantum Dots Nanobeads

Fluorescent Lateral Flow Immunoassay Based on Quantum Dots Nanobeads

Published on: June 28, 2024

Area of Science:

Materials Science
Nanotechnology
Environmental Science

Background:

Carbon quantum dots (CQDs) are versatile nanomaterials with unique optical properties.
Developing sustainable and cost-effective synthesis methods for CQDs is crucial.
Utilizing agricultural waste as a precursor offers an eco-friendly approach.

Purpose of the Study:

To synthesize carbon quantum dots (CQDs) from tomato biomass (stems and fruits).
To investigate the influence of precursor origin on CQD properties and luminescence.
To evaluate the application of CQDs for sensitive detection of Cu²⁺ ions.

Main Methods:

Green synthesis of CQDs using tomato stems and fruits as carbon precursors.
Nitrogen doping using m-aminobenzoic acid to tune surface chemistry and optical properties.
Characterization of CQD structure, surface chemistry, and photoluminescence.
Assessing Cu²⁺ ion sensing capabilities via fluorescence quenching.

Main Results:

Colloidally stable CQDs were synthesized from tomato biomass.
Precursor origin significantly impacted CQD defect density, hybridization, and functional groups.
CQDs exhibited excitation-dependent photoluminescence.
Both fruit- and stem-derived CQDs showed efficient fluorescence quenching with Cu²⁺ ions.
Sensitive detection of Cu²⁺ ions with low limits of detection (0.059 µM and 0.048 µM) was achieved.

Conclusions:

Tomato biomass is a viable precursor for synthesizing functional CQDs.
Biomass composition and surface chemistry critically influence CQD photophysics and sensing.
This work presents a sustainable strategy for valorizing agricultural waste into nanomaterials for metal ion sensing.