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NMR Spectroscopy Of Amines

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...

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Manufacturing of a Nafion-coated, Reduced Graphene Oxide/Polyaniline Chemiresistive Sensor to Monitor pH in Real-time During Microbial Fermentation

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Room-Temperature Ammonia Sensing Using Polyaniline-Coated Laser-Induced Graphene.

José Carlos Santos-Ceballos^1,2,3, Foad Salehnia^1,2,3, Frank Güell^1,4

¹MINOS, School of Engineering, Universitat Rovira i Virgili, Avda. Països Catalans 26, 43007 Tarragona, Spain.

Sensors (Basel, Switzerland)

|December 17, 2024

Summary

Researchers developed a new flexible nanocomposite sensor using laser-induced graphene and polyaniline for highly sensitive ammonia detection at room temperature. This breakthrough enables low-cost, wearable gas sensing for environmental safety.

Keywords:

ammonia gas sensing laser-induced graphene polyaniline

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Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Ammonia detection is vital for environmental safety and mitigating hazardous pollutant risks.
Existing methods for ammonia sensing often lack sensitivity, flexibility, or room-temperature operability.

Purpose of the Study:

To develop a novel chemo-resistive nanocomposite for sensitive ammonia detection at room temperature.
To explore the use of electrochemically modified laser-induced graphene (LIG) with polyaniline (PANI) for gas sensing applications.

Main Methods:

Electrochemical modification of laser-induced graphene (LIG) with polyaniline (PANI) to create a PANI@LIG nanocomposite.
Characterization of the PANI@LIG composite using field emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS).

Main Results:

Successful fabrication of a PANI@LIG nanocomposite material.
Demonstration of the PANI@LIG composite's capability for chemo-resistive gas sensing of ammonia at room temperature.
Characterization confirmed the composite's structure and composition.

Conclusions:

The PANI@LIG nanocomposite offers a promising platform for sensitive and flexible ammonia gas sensing at room temperature.
This study presents a simple and effective method for creating low-cost, wearable gas sensors.
The PANI@LIG composite represents a novel material for advanced gas sensing technologies.