Related Experiment Video
Updated: Feb 22, 2026
05:16
Flying Insect Detection and Classification with Inexpensive Sensors
Published on: October 15, 2014
25.8K
Artificial Intelligence-Integrated Overcoupled Resonator for Multifunctional Pesticide Spectral Classification and
Dongxiao Li1,2, Ziwei Chen3, Xueyuan Wu3
1Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore.
ACS Nano
|February 21, 2026
Summary
This study introduces an overcoupled (OC) resonator and artificial intelligence (AI) platform for sensitive pesticide residue detection. The novel system achieves high accuracy in identifying multiple pesticides, even at trace levels, ensuring food and environmental safety.
Area of Science:
- Optoelectronics
- Spectroscopy
- Artificial Intelligence
Background:
- Conventional pesticide detection methods face limitations due to diverse chemicals, overlapping spectral signatures, and low concentrations.
- Ensuring food safety and environmental health necessitates advanced techniques for accurate pesticide residue analysis.
Purpose of the Study:
- To develop a multifunctional platform for pesticide analysis using an overcoupled (OC) resonator and artificial intelligence (AI).
- To overcome the limitations of conventional methods by enhancing detection efficiency, sensitivity, and applicability for various pesticide molecules.
Main Methods:
- Utilized an OC resonator with an ultrabroadband spectral response (1650-750 cm-1) for resonance-free detection of multiple pesticides.
- Integrated AI algorithms for spectral classification, concentration prediction, and signal reconstruction to manage complex spectral data.
- Achieved trace-level detection with a minimum limit of detection of 12.5 ng·μL-1.
Main Results:
- Demonstrated a 1685-fold bandwidth enhancement in the OC resonator, eliminating the need for resonance tuning.
- AI algorithms achieved 100% classification accuracy for complex pesticide mixtures.
- Successfully detected pesticide residues in real-world samples (apple peels, lake water) with high selectivity and interference suppression.
Conclusions:
- The OC resonator-AI platform offers a versatile and highly sensitive solution for multifunctional pesticide analysis.
- This approach advances ultratrace molecular diagnostics and provides a framework for developing novel sensors for food safety and environmental monitoring.
Related Concept Videos
01:26Raman Spectroscopy Instrumentation: Overview
1.4K
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
1.4K
01:13Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
1.3K
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
The ATR process begins by directing a beam...
1.3K
01:12Double Resonance Techniques: Overview
797
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
797
01:21IR Absorption Frequency: Hybridization
1.4K
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
1.4K
01:24IR Spectroscopy: Molecular Vibration Overview
4.9K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
4.9K
01:11Applications of IR Spectroscopy: Overview
2.4K
The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
2.4K