A tunable volatile organic compound sensor by using PtOx/GQDs/TiO2 nanocomposite thin films at room temperature under visible-light activation

Gas sensors based on CaFe2O4 nanopowders, which are p–type metal oxide semiconductor (MOX), have been fabricated and assessed for ethanol gas monitoring under visible light activation at room temperature. Regardless of their inferior sensitivity compared to thermally activated counterparts, the developed sensors have shown responsive sensing behavior towards ethanol vapors confirming the ability of using visible light for sensor activation. LEDs with different wavelengths (i.e., 465–590 nm) were employed. The highest sensitivity (3.7%) was reached using green LED activation that corresponds to the band gap of CaFe2O4.

Download Full-text

Visible light activation of room temperature NO 2 gas sensors based on ZnO, SnO 2 and In 2 O 3 sensitized with CdSe quantum dots

Thin Solid Films ◽

10.1016/j.tsf.2016.09.029 ◽

2016 ◽

Vol 618 ◽

pp. 253-262 ◽

Cited By ~ 28

Author(s):

A.S. Chizhov ◽

M.N. Rumyantseva ◽

R.B. Vasiliev ◽

D.G. Filatova ◽

K.A. Drozdov ◽

...

Keyword(s):

Quantum Dots ◽

Visible Light ◽

Gas Sensors ◽

Room Temperature ◽

Cdse Quantum Dots ◽

Light Activation ◽

Visible Light Activation

Download Full-text

Practical room temperature formaldehyde sensing based on combination of visible-light activation and dipole modification

Journal of Materials Chemistry A ◽

10.1039/d1ta06346d ◽

2021 ◽

Author(s):

Hongping Liang ◽

Lanpeng Guo ◽

Nengjie Cao ◽

huiyun Hu ◽

Hao Li ◽

...

Keyword(s):

Visible Light ◽

Indoor Air Quality ◽

Indoor Air ◽

Room Temperature ◽

Quality Monitoring ◽

Air Quality Monitoring ◽

Light Activation ◽

Formaldehyde Sensing ◽

Modified Graphene ◽

Visible Light Activation

Implementing sensitive and fast ppb-level formaldehyde sensing at room temperature is still extremely demanded for practical indoor air quality monitoring. Herein, we developed a visible-light sensitive and dipole modified graphene-based...

Download Full-text

Room Temperature Fluorescence Gas Sensor Based on Coated TiO2 Nanoparticles

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.543.373 ◽

2013 ◽

Vol 543 ◽

pp. 373-376 ◽

Cited By ~ 1

Author(s):

Nurul Huda Yusoff ◽

Muhamad Mat Salleh ◽

Muhammad Yahaya

Keyword(s):

Thin Film ◽

Thin Films ◽

Gas Sensor ◽

Fluorescence Spectra ◽

Room Temperature ◽

Emission Spectra ◽

Selective Property ◽

Organic Vapors ◽

Volatile Organic ◽

Sensing Sensitivity

Room temperature fluorescence gas sensor was developed based on TiO2 nanoparticles coated with porphyrin dye thin films. The porphyrin dye used for this experiment were Iron (III) meso-tetraphenylporphine chloride (IMTPPCl) and Manganase (III) 5,10,15,20 tetra (4-pyridyl)-21H, 23H porphine chloride tetrakis (metachloride). The sensing sensitivity was due to the changes of the emission spectra produce by the thin film when expose to the organic vapors from volatile organic compounds; ethanol, acetone and 2-propanol. Both thin films show good response toward volatile organic vapors. However, TiO2 nanoparticles with porphyrin; IMTPPCl thin film shows pronounced interaction, marked fluorescence spectra and more selective property, hence useful for chemical identification purpose.

Download Full-text

Surface Morphologies of PVDF-TrFE/MgO Nanocomposite Thin Films and its Effect on the Ferroelectric Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1134.6 ◽

2015 ◽

Vol 1134 ◽

pp. 6-11 ◽

Cited By ~ 1

Author(s):

Mohamad Hafiz Mohd Wahid ◽

Rozana Mohd Dahan ◽

Siti Zaleha Sa'ad ◽

Adillah Nurashikin Arshad ◽

Muhamad Naiman Sarip ◽

...

Keyword(s):

Thin Film ◽

Thin Films ◽

Dielectric Constant ◽

Dielectric Properties ◽

Magnesium Oxide ◽

Ferroelectric Properties ◽

Filler Loading ◽

Nanocomposite Thin Film ◽

Nanocomposite Thin Films ◽

Surface Morphologies

The enhancement of ferroelectric and dielectric properties of PVDF-TrFE by incorporating various percentages of Magnesium Oxide (1 – 7%) for spin coated nanocomposite thin film was demonstrated. Observations showed uniform distribution and low agglomeration of MgO in the PVDF-TrFE nanocomposite thin film, especially for 3% MgO. Additionally, the 3% MgO incorporated into PVDF-TrFE had generated the highest Pr (88 mC/m2) and dielectric constant (13.6) in comparison other percentage compositions. However, the addition of more than 3% MgO filler loading caused a reduction in the ferroelectric and dielectric properties of the nanocomposite thin films.

Download Full-text

Optical, Electrical, and Surface Properties of Cu/Plasma Polymer Fluorocarbon Nanocomposite Thin Film Fabricated Using Metal/Polymer Composite Target

Applied Sciences ◽

10.3390/app9071296 ◽

2019 ◽

Vol 9 (7) ◽

pp. 1296 ◽

Cited By ~ 1

Author(s):

Sung Kim ◽

Mac Kim ◽

Jae Park ◽

Sang-Jin Lee

Keyword(s):

Thin Film ◽

Thin Films ◽

Polymer Composite ◽

Plasma Polymer ◽

Nanocomposite Thin Film ◽

Power Sources ◽

X Ray ◽

Dc Power ◽

Nanocomposite Thin Films ◽

Metal Polymer

We propose a new method of fabricating metal–polymer composite targets for sputtering, which makes it easier to control the composition and enables the homogeneous and reproducible fabrication of metal–polymer nanocomposites over large areas. Using Cu/polytetrafluoroethylene composite targets containing 20, 50, and 80 wt.% Cu, Cu/plasma polymer fluorocarbon (PPFC) nanocomposite thin films were prepared by radio-frequency (RF) sputtering. Targets with 80 wt.% Cu were conductive; moreover, sputtering was possible not only with RF but also with mid-range frequency (MF) and direct current (DC) power sources. The nanocomposite thin film deposited by MF and DC power using an 80 wt.% Cu target showed near-metallic characteristics, exhibited absorption peaks at 618 and 678 nm, and had a surface resistance of 2 × 104 and 34.55 Ω/sq, respectively. We also analyzed the structure and composition of the Cu/PPFC nanocomposite films by X-ray diffraction and X-ray photoelectron spectroscopy. The described metal–polymer targets can advance the applications and commercialization of nanocomposite thin films.

Download Full-text

Editorial for the Special Issue on “10th Anniversary of Nanomaterials—Recent Advances in Nanocomposite Thin Films and 2D Materials”

Nanomaterials ◽

10.3390/nano11082069 ◽

2021 ◽

Vol 11 (8) ◽

pp. 2069

Author(s):

Jordi Sort ◽

Gemma Rius

Keyword(s):

Thin Film ◽

Thin Films ◽

2D Materials ◽

Wide Spectrum ◽

Nanocomposite Thin Film ◽

Special Issue ◽

10Th Anniversary ◽

Research Challenges ◽

Nanocomposite Thin Films ◽

Original Works

As a way to celebrate the 10th anniversary of the journal Nanomaterials, this Special Issue within the section ‘Nanocomposite thin film and 2D materials’ provides an overview of the wide spectrum of research challenges and applications in the field, represented by a collection of 12 contributions, including three up-to-date review articles plus nine original works, in different targeted topics as described below [...]

Download Full-text

Enhancement of Gas Sensing Properties of CdS Nanowire/ZnO Nanosphere Composite Materials at Room Temperature by Visible-Light Activation

ACS Applied Materials & Interfaces ◽

10.1021/am200008y ◽

2011 ◽

Vol 3 (7) ◽

pp. 2253-2258 ◽

Cited By ~ 79

Author(s):

Jiali Zhai ◽

Lingling Wang ◽

Dejun Wang ◽

Haiyan Li ◽

Yu Zhang ◽

...

Keyword(s):

Composite Materials ◽

Visible Light ◽

Room Temperature ◽

Gas Sensing ◽

Light Activation ◽

Sensing Properties ◽

Cds Nanowire ◽

Gas Sensing Properties ◽

Visible Light Activation

Download Full-text

Structure and Properties of Electrocodeposited Cu-Al2O3 Nanocomposite Thin Films

Journal of Engineering Materials and Technology ◽

10.1115/1.1925292 ◽

2005 ◽

Vol 127 (4) ◽

pp. 451-456 ◽

Cited By ~ 20

Author(s):

Yong Gan ◽

Dongyun Lee ◽

Xi Chen ◽

Jeffrey W. Kysar

Keyword(s):

Thin Film ◽

Thin Films ◽

Mechanical Properties ◽

Grain Size ◽

Pure Copper ◽

Volume Density ◽

Mems Devices ◽

Nanocomposite Thin Film ◽

Microchannel Array ◽

Nanocomposite Thin Films

Nanocomposite thin films which consist of 50nmAl2O3 nanoparticles in a copper metal matrix were deposited on a silicon wafer. The thickness of the nanocomposite thin films was about 3microns and the volume density of the nanoparticles was between 3% and 5%. The films were synthesized using electrocodeposition. The grain size of the nanocomposite film was significantly smaller than the grain size of control films of pure copper. Electron backscatter diffraction (EBSD) experiments indicate that neither the nanocomposite thin films nor the control films exhibits a crystallographic texture. Nanoindentation experiments show that the hardness of the nanocomposite thin film is approximately 25% higher than the hardness of the control films of pure copper. A prototype of a microchannel array in the nanocomposite thin film was made using standard microelectromechanical (MEMS) fabrication technology. It is expected that the enhanced mechanical properties exhibited by nanocomposite thin films have the potential to improve the reliability of various MEMS devices which rely on thin metal films. The results presented herein lay the groundwork for future studies in which the size, volume density, morphology, distribution as well as type of nanoparticle in the nanocomposite will be systematically and independently varied in order to optimize mechanical properties.

Download Full-text