Archive for the ‘Content’ Category

Colorimetric determination of perfluorocarboxylic acids using porphyrin hosts and mobile phone photographs

About this infographic:

Persistent and harmful pollutants commonly known as “PFAS” are increasingly found in our soil and water. These human-made chemicals are used in non-stick cookware, food packaging, water-resistant fabrics, and firefighting foams and have been shown to persist in the environment and have detrimental effects on human health. While many PFAS have been banned, others are still being manufactured. Detecting these pollutants is the first step toward restoring polluted environments.

The existing methods to detect PFAS are slow and use expensive laboratory equipment. The authors have made chemical sensors that instantly change colour from red to green when shaken with common PFAS pollutants. The technique uses a method called “host-guest” chemistry. A large, coloured molecule, -a porphyrin- forms a “basket” shaped cavity. The authors thought about specific PFAS molecules they investigated to occupy the “basket”, and when they do, the porphyrin changes colour. The naked eye can detect colour response to these PFAS, but using mobile phone photographs allows us to estimate the concentrations to lower levels.



Sensors and Diagnostics, a new open access journal where we highlight emerging research on physical, chemical and bio sensors, as well as sensor devices and systems.

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Sensors & Diagnostics – the first articles, free to read

We are delighted to share with you today the first articles published in Sensors & Diagnostics.

Sensors & Diagnostics is a gold open access journal for high-impact sensors research. We highlight emerging research on physical, chemical and bio sensors, as well as sensor devices and systems.

Read the first articles now

There are 4 fantastic free to read articles on topics ranging from in situ recalibration of electrodes to a colorimetric assay involving aggregation of gold nanocomposites for the detection of proteins.

Read on to see the 4 papers and to hear the thoughts of our authors.



Electroanalytical overview: the electroanalytical sensing of hydrazine
Robert D. Crapnell and Craig E. Banks
Sens. Diagn., 2022, Advance Article
DOI: 10.1039/D1SD00006C


Professor Craig Banks on his work: Our paper, one in a series providing an electroanalytical overview of…hydrazine, provides an authoritative overview of the past sensing of hydrazine with a summary of the current approaches, in addition to providing researchers with targets/goals of what is needed to push this field further.”




In situ recalibration of ion selective electrodes
Neel Sisodia, Kay L. McGuinness, Jay D. Wadhawan and Nathan S. Lawrence
Sens. Diagn., 2022, Advance Article
DOI: 10.1039/D1SD00003A


Dr Nathan Lawrence comments that When we first read the scope of Sensors and Diagnostics we knew this work would be an ideal fit. Our inaugural article in Sensors & Diagnostics focuses on improving classical glass pH sensors by real time monitoring and compensation for reference electrode drift (one of the key causes of routine field calibration of pH sensors).”






Quad-band terahertz metamaterial absorber enabled by an asymmetric I-type resonator formed from three metallic strips for sensing application
Ben-Xin Wang, Yangkuan Wu, Wei Xu, Zhuchuang Yang, Liming Lu and Fuwei Pi
Sens. Diagn., 2022, Advance Article
DOI: 10.1039/D1SD00005E


Professor Ben-Xin Wang explains the key features of their work: “Dimension changes of the [I-type] resonator, especially the metallic strip in the vertical direction, have an important role in controlling quad-band absorption performance, these results should have potential applications in terms of detection, sample composition identification or sensing.”



Colorimetric assay based on iron(III) ions triggering the aggregation of a poly(tannic acid) coated Au nanocomposite for carbonic anhydrase II detection
Jiale Pan, Junjiao Yang, Shiman Yao and Jing Yang
Sens. Diagn., 2022, Advance Article
DOI: 10.1039/D1SD00015B


Dr Jing Yang comments that a domino-type protein sensor was explored, in which….released iron (III) ions from mesoporous silica nanoparticles coordinate with poly(tannic acid), leading to AuNP aggregation and the change of the visual colour.”


We hope you enjoy reading these articles!


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Sensors & Diagnostics is the home for innovative research on sensors, sensing devices and systems.
A gold open access journal, all article-processing charges (APCs) are waived until mid-2024.

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