Special Issue "Nanomaterials for Gas Sensors Applications"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: 10 January 2021.

Special Issue Editor

Prof. Dr. Giuseppe Cappelletti
Website
Guest Editor
Universita' degli Studi Di Milano, Dipartimento di Chimica, via Golgi 19, 20133 Milano, Italy
Interests: nanomaterials; gas sensor; volatile organic compounds; breath analysis; oxides semiconductors; point-of-care devices; sensitivity; selectivity
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Special Issue Information

Dear Colleagues,


Solid state gas sensors have been deeply investigated in recent decades, especially for environmental monitoring, process safety control, and, more recently, for the medical diagnosis of human diseases from breath analysis. The miniaturization and integration of such sensors in microsystems has led to low-cost, portable devices that are capable of selectively recognizing specific analytes. In this context, semiconductor nanomaterials have attracted great attention thanks to their unique physicochemical properties. However, there are still some drawbacks to their use, concerning the sensitive and selective sensing of volatile organic compounds (VOCs), particularly at room temperature. Hence, innovative metal oxide-based composites have recently been proposed, resulting in very promising sensing materials.


This Special Issue of Nanomaterials will attempt to cover the recent developments in gas sensors based on metal oxide semiconductor nanomaterials, showing highly sensitive and selective responses mainly towards volatile organic compounds.

Prof. Dr. Giuseppe Cappelletti
Guest Editor

Manuscript Submission Information

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Keywords

  • nanomaterials
  • gas sensor
  • volatile organic compounds
  • breath analysis
  • oxides semiconductors
  • point-of-care devices
  • sensitivity
  • selectivity

Published Papers (2 papers)

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Research

Open AccessArticle
Enhanced Stability and Amplified Signal Output of Single-Wall Carbon Nanotube-Based NH3-Sensitive Electrode after Dual Plasma Treatment
Nanomaterials 2020, 10(6), 1026; https://doi.org/10.3390/nano10061026 - 27 May 2020
Abstract
Pristine nanomaterials are normally prepared using finely controlled fabrication processes. Because no imperfect nanostructure remains, they cannot be used directly as electrode substrates of functional devices. This is because perfectly organized nanostructures or nanomaterials commonly require posttreatment to generate intentionally, the kinds of [...] Read more.
Pristine nanomaterials are normally prepared using finely controlled fabrication processes. Because no imperfect nanostructure remains, they cannot be used directly as electrode substrates of functional devices. This is because perfectly organized nanostructures or nanomaterials commonly require posttreatment to generate intentionally, the kinds of desirable defects inside or on their surfaces that enable effective functionalization. Plasma treatment is an easier, simpler and more widely used way (relative to other methods) to modify a variety of nanomaterials, although plasma-functionalized nano surfaces commonly have a short lifetime. We present herein a dual plasma treatment (DPT) that significantly enhances the degree and lifetime of plasma-induced surface functional groups on single-walled carbon nanotubes (SWCNTs). The DPT process consists of two individually optimized oxygen–plasma treatments. The DPT-modified SWCNT functioned as a sensing material for ammonia gas for more than a month. It also provided more than three times the degree of functionality for amplified signal output than with a single-plasma-treated SWCNT electrode. Full article
(This article belongs to the Special Issue Nanomaterials for Gas Sensors Applications)
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Open AccessFeature PaperArticle
Exploring SnxTi1−xO2 Solid Solutions Grown onto Graphene Oxide (GO) as Selective Toluene Gas Sensors
Nanomaterials 2020, 10(4), 761; https://doi.org/10.3390/nano10040761 - 15 Apr 2020
Abstract
The major drawback of oxide-based sensors is the lack of selectivity. In this context, SnxTi1−xO2/graphene oxide (GO)-based materials were synthesized via a simple hydrothermal route, varying the titanium content in the tin dioxide matrix. Then, toluene and [...] Read more.
The major drawback of oxide-based sensors is the lack of selectivity. In this context, SnxTi1−xO2/graphene oxide (GO)-based materials were synthesized via a simple hydrothermal route, varying the titanium content in the tin dioxide matrix. Then, toluene and acetone gas sensing performances of the as-prepared sensors were systematically investigated. Specifically, by using 32:1 SnO2/GO and 32:1 TiO2/GO, a greater selectivity towards acetone analyte, also at room temperature, was obtained even at ppb level. However, solid solutions possessing a higher content of tin relative to titanium (as 32:1 Sn0.55Ti0.45O2/GO) exhibited higher selectivity towards bigger and non-polar molecules (such as toluene) at 350 °C, rather than acetone. A deep experimental investigation of structural (XRPD and Raman), morphological (SEM, TEM, BET surface area and pores volume) and surface (XPS analyses) properties allowed us to give a feasible explanation of the different selectivity. Moreover, by exploiting the UV light, the lowest operating temperature to obtain a significant and reliable signal was 250 °C, keeping the greater selectivity to the toluene analyte. Hence, the feasibility of tuning the chemical selectivity by engineering the relative amount of SnO2 and TiO2 is a promising feature that may guide the future development of miniaturized chemoresistors. Full article
(This article belongs to the Special Issue Nanomaterials for Gas Sensors Applications)
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