A new method of depositing tin dioxide nanofibers in order to develop chemical sensors is presented. It involves an electrospinning process with in-plane electrostatic focusing over micromechanized substrates. It is a fast and reproducible method. After an annealing process, which can be performed by the substrate heaters, it is observed that the fibers are intertwined forming porous networks that are randomly distributed on the substrate. The fiber diameters oscillate from 100 nm to 200 nm and fiber lengths reach several tens of microns. Each fiber has a polycrystalline structure with multiple nano-grains. The sensors have been tested for the detection of acetone and hydrogen peroxide (precursors of the explosive triacetone triperoxide, TATP) in air in the ppm range. High and fast responses to these gases have been obtained.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4299108 | PMC |
| http://dx.doi.org/10.3390/s141224231 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Organometallic Compound Stabilizes All-Inorganic Tin-Based Perovskite Nanocrystals Against Antisolvent Post-Treatment.
Small
December 2024
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
The isolation and purification of all-inorganic Sn-based perovskite nanocrystals (PNCs) remain troublesome, as common antisolvents accelerate the collapse of the optically active perovskite structure. Here, we mitigate such instabilities and endow strong resistance to antisolvent by incorporating the organometallic compound zinc diethyldithiocarbamate, Zn(DDTC), during the solution-based synthesis of all-inorganic CsSnI nanocrystals. Thiourea is shown to form through the thermal-driven conversion of Zn(DDTC) during synthesis, which binds to un-passivated Sn sites on the crystal surface and shields it from irreversible oxidation reactions.
View Article and Find Full Text PDFEnhancing the Performance of Nanocrystalline SnO for Solar Cells through Photonic Curing Using Impedance Spectroscopy Analysis.
Nanomaterials (Basel)
September 2024
Département de Génie Électrique, École de Technologie Supérieure, 1100 Rue Notre-Dame Ouest, Montréal, QC H3C 1K3, Canada.
Article Synopsis
- Wide-bandgap tin oxide (SnO2) thin films are important for perovskite solar cells because they maintain stability under heat and environmental changes, but traditional methods for crystallization demand high temperatures and prolonged times, limiting production options.
- This study introduces a quicker method involving intense pulsed light to crystallize SnO2 films in just 500 μs, vastly improving efficiency and manufacturing potential.
- Results show that this light-induced crystallization leads to better surface quality and superior electrical performance due to enhanced charge transfer and improved structural contact when compared to conventionally processed SnO2 films.
Mechanochemical synthesis is an extremely useful strategy to reach thermoelectric materials due to its solvent-free one-step character, as the targeted thermoelectricity (TE) materials in a nanocrystalline format can be prepared by mere high-energy milling of elemental precursors. Nevertheless, the subsequent densification method (e.g.
View Article and Find Full Text PDFDirect Growth of BiSeO Thin Films for High-k Dielectrics via Atomic Layer Deposition.
ACS Nano
August 2024
Thin Film Materials Research Center, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Daejeon, Yuseong-gu 34114, Republic of Korea.
This study describes a modified atomic layer deposition (ALD) process for fabricating BiOSe thin films, targeting their application as high-k dielectrics in semiconductor devices, especially for two-dimensional semiconductors. Using an intermediate-enhanced ALD technique for BiSe and a plasma-enhanced ALD process for BiO, a method for the sequential deposition of BiSeO ternary films has been established. The thin film has been deposited on SiO and TiN substrates, exhibiting growth rates of 0.
View Article and Find Full Text PDFUltrathin Boundary-Less SnO Films with Surface-Activated Two-Dimensional Nanograins Enable Fast and Sensitive Hydrogen Gas Sensing.
ACS Sens
May 2024
Department of Materials Science and Engineering, National University of Singapore, Singapore 117574, Singapore.
Fast and reliable semiconductor hydrogen sensors are crucially important for the large-scale utilization of hydrogen energy. One major challenge that hinders their practical application is the elevated temperature required, arising from undesirable surface passivation and grain-boundary-dominated electron transportation in the conventional nanocrystalline sensing layers. To address this long-standing issue, in the present work, we report a class of highly reactive and boundary-less ultrathin SnO films, which are fabricated by the topochemical transformation of 2D SnO transferred from liquid Sn-Bi droplets.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!