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Chemosensors, Volume 9, Issue 7

July 2021 - 37 articles

Cover Story: In this paper, we investigate humidity sensing through impedance measurements with TiO2 nanoparticles (about 6 nm in diameter) that are also functionalized with Au nanoparticles. The transient behavior and the impedance spectra are measured and interpreted from the theoretical point of view. Large responses are shown, especially in the relative humidity range 30%–80%, which are essentially explained by condensation in the nanopores. The addition of Au allows for the sensing film response and recovery time to be dramatically reduced, and it seems to favor condensation for RH larger than 70%. The obtained results relate the sensing performance of the nano-structured film to the phenomena occurring during water adsorption, as well as its effect on the electron and ion transports and the film characteristics. View this paper.
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Articles (37)

  • Article
  • Open Access
9 Citations
4,362 Views
10 Pages

Development of Polydiacetylene-Based Testosterone Detection as a Model Sensing Platform for Water-Insoluble Hormone Analytes

  • Jaewon Jung,
  • Sung-Min An,
  • Eun-Kyung Lim,
  • Seung-Chul Kim,
  • Beum-Soo An and
  • Sungbaek Seo

We have developed a polydiacetylene (PDA)-based sensing platform to detect testosterone (T) as a potential biomarker of preterm birth. The insolubility of the steroid hormone in water, where PDA assemblies are dispersed, poses a major issue, since th...

  • Article
  • Open Access
16 Citations
5,160 Views
10 Pages

Optical chemical sensors can yield distinctively different responses that are dependent on the method applied for readout and evaluation. We therefore present a comprehensive study on the pH determined non-continuously with optical sensors in real mi...

  • Article
  • Open Access
2 Citations
3,198 Views
9 Pages

Nanoparticle Determination in Water by LED-Excited Surface Plasmon Resonance Imaging

  • Lukas Wunderlich,
  • Peter Hausler,
  • Susanne Märkl,
  • Rudolf Bierl and
  • Thomas Hirsch

The increasing popularity of nanoparticles in many applications has led to the fact that these persistent materials pollute our environment and threaten our health. An online sensor system for monitoring the presence of nanoparticles in fresh water w...

  • Article
  • Open Access
2 Citations
2,877 Views
11 Pages

Surface Acoustic Wave Biosensor with Laser-Deposited Gold Layer Having Controlled Porosity

  • Dana Miu,
  • Izabela Constantinoiu,
  • Valentina Dinca and
  • Cristian Viespe

Laser-deposited gold immobilization layers having different porosities were incorporated into love wave surface acoustic wave sensors (LW-SAWs). Variation of pulsed laser deposition parameters allows good control of the gold film morphology. Biosenso...

  • Article
  • Open Access
13 Citations
5,172 Views
12 Pages

Graphene Bioelectronic Nose for the Detection of Odorants with Human Olfactory Receptor 2AG1

  • Danielle M. Goodwin,
  • Ffion Walters,
  • Muhammad Munem Ali,
  • Ehsaneh Daghigh Ahmadi and
  • Owen J. Guy

A real-time sensor for the detection of amyl butyrate (AB) utilising human olfactory receptor 2AG1 (OR2AG1), a G-protein coupled receptor (GPCR) consisting of seven transmembrane domains, immobilized onto a graphene resistor is demonstrated. Using CV...

  • Article
  • Open Access
6 Citations
3,706 Views
16 Pages

Sniff Species: SURMOF-Based Sensor Array Discriminates Aromatic Plants beyond the Genus Level

  • Salih Okur,
  • Chun Li,
  • Zejun Zhang,
  • Sahi Vaidurya Pratap,
  • Mohammed Sarheed,
  • Adnan Kanbar,
  • Leonard Franke,
  • Felix Geislhöringer,
  • Lars Heinke and
  • Uli Lemmer
  • + 2 authors

Lamiaceae belong to the species-richest family of flowering plants and harbor many species that are used as herbs or in medicinal applications such as basils or mints. The evolution of this group has been driven by chemical speciation, mainly volatil...

  • Article
  • Open Access
16 Citations
4,915 Views
20 Pages

Expediting Disulfiram Assays through a Systematic Analytical Quality by Design Approach

  • João Basso,
  • Maria Luísa Ramos,
  • Alberto Pais,
  • Rui Vitorino,
  • Ana Fortuna and
  • Carla Vitorino

An Analytical Quality by Design (AQbD) approach is presented, aiming at the development and validation of an HPLC method for the quantification of disulfiram and copper diethyldithiocarbamate in lipid nanoparticles. Following the definition of the an...

  • Article
  • Open Access
8 Citations
3,341 Views
12 Pages

The Monitoring of Black-Odor River by Electronic Nose with Chemometrics for pH, COD, TN, and TP

  • Shanshan Qiu,
  • Pingzhi Hou,
  • Jingang Huang,
  • Wei Han and
  • Zhiwei Kang

Black-odor rivers are polluted urban rivers that often are black in color and emit a foul odor. They are a severe problem in aquatic systems because they can negatively impact the living conditions of residents and the functioning of ecosystems and l...

  • Article
  • Open Access
81 Citations
9,422 Views
14 Pages

PANI-Based Wearable Electrochemical Sensor for pH Sweat Monitoring

  • Francesca Mazzara,
  • Bernardo Patella,
  • Chiara D’Agostino,
  • Maria Giuseppina Bruno,
  • Sonia Carbone,
  • Francesco Lopresti,
  • Giuseppe Aiello,
  • Claudia Torino,
  • Antonio Vilasi and
  • Alan O’Riordan
  • + 1 author

Nowadays, we are assisting in the exceptional growth in research relating to the development of wearable devices for sweat analysis. Sweat is a biofluid that contains useful health information and allows a non-invasive, continuous and comfortable col...

  • Article
  • Open Access
7 Citations
3,091 Views
21 Pages

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

  • Tommaso Addabbo,
  • Irene Cappelli,
  • Ada Fort,
  • Marco Mugnaini,
  • Enza Panzardi,
  • Valerio Vignoli and
  • Cecilia Viti

In this paper, we investigate humidity sensing through impedance measurements with TiO2 nanoparticles (about 6 nm in diameter). The transient behavior and the impedance spectra are measured and interpreted from the theoretical point of view. Large re...

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Chemosensors - ISSN 2227-9040