Role of the mineral binder in the sensing properties of screen-printed layers of semiconductor oxides Sr1−yCayFeO3−x (0 ⩽ y ⩽ 1; 0.19 ⩽ x ⩽ 0.50)

In this work, TiO2 QDs-modified NiO nanosheets were employed to improve the room temperature NO2 sensing properties of NiO. The gas sensing studies showed that the response of nanocomposites with the optimal ratio to 60 ppm NO2 was nearly 10 times larger than that of bare NiO, exhibiting a potential application in gas sensing. Considering the commonly reported immature mechanism that the effective charge transfer between two phases contributes to an enhanced sensitivity, the QDs sensitization mechanism was further detailed by designing a series of contrast experiments. First, the important role of the QDs size effect was revealed by comparing the little enhanced sensitivity of TiO2 particle-modified NiO with the largely enhanced sensitivity of TiO2 QDs-NiO. Second, and more importantly, direct evidence of the heterointerface charge transfer efficiency was detailed by the extracted interface bond (Ti-O-Ni) using XPS peak fitting. This work can thus provide guidelines to design more QDs-modified nanocomposites with higher sensitivity for practical applications.

Download Full-text

The role of strain localization on the electrical behavior of flexible and stretchable screen printed silver inks on polymer substrates

Materialia ◽

10.1016/j.mtla.2020.100642 ◽

2020 ◽

Vol 10 ◽

pp. 100642

Author(s):

Gabe Cahn ◽

Alejandro Barrios ◽

Samuel Graham ◽

Jeff Meth ◽

Antonia Antoniou ◽

...

Keyword(s):

Strain Localization ◽

Electrical Behavior ◽

Polymer Substrates ◽

Screen Printed

Download Full-text

Electrogenerated chemiluminescence resonance energy transfer between ZnGa2O4/g-C3N4 and gold nanoparticles/graphene and its application in the detection of thrombin

The Analyst ◽

10.1039/d0an01558j ◽

2020 ◽

Vol 145 (22) ◽

pp. 7412-7420

Author(s):

Hui Liu ◽

Hao Yin ◽

TingTing Yang ◽

HouCheng Ding ◽

YongPing Dong

Keyword(s):

Gold Nanoparticles ◽

Energy Transfer ◽

Resonance Energy Transfer ◽

Resonance Energy ◽

Electrogenerated Chemiluminescence ◽

Label Free ◽

Spinel Type ◽

Semiconductor Oxides ◽

Type Semiconductor

A label-free ECL sensor for thrombin was fabricated based on ECL resonance energy transfer occurred between ZnGa2O4/g-C3N4 and AuNP/GR nanocomposites, which revealed a new role of spinel-type semiconductor oxides in the fabrication of ECL sensors.

Download Full-text

Geometric Effect of ZnO Nanorods on Ethanol Sensing Properties: The Relative Role of a Seed Layer

Journal of The Electrochemical Society ◽

10.1149/2.012202jes ◽

2011 ◽

Vol 159 (2) ◽

pp. E23-E29 ◽

Cited By ~ 5

Author(s):

Hosang Ahn ◽

H. Clyde Wikle ◽

Seon-Bae Kim ◽

Dan Liu ◽

Sungkoo Lee ◽

...

Keyword(s):

Seed Layer ◽

Zno Nanorods ◽

Relative Role ◽

Geometric Effect ◽

Sensing Properties ◽

Ethanol Sensing

Download Full-text

The role of oxygen vacancies in the sensing properties of Ni substituted SnO2 microspheres

RSC Advances ◽

10.1039/c8ra05679j ◽

2018 ◽

Vol 8 (58) ◽

pp. 33080-33086 ◽

Cited By ~ 4

Author(s):

Jianwu Sun ◽

Guilin Yin ◽

Ting Cai ◽

Weiwei Yu ◽

Fang Peng ◽

...

Keyword(s):

Oxygen Vacancies ◽

Ni Doping ◽

Sensing Properties

The influence of Ni doping in SnO2 microspheres was investigated in this study.

Download Full-text

On the Role of Oxygen Vacancies in the Determination of the Gas-Sensing Properties of Tin-Oxide Nanowires

MRS Proceedings ◽

10.1557/proc-0915-r04-06 ◽

2006 ◽

Vol 915 ◽

Cited By ~ 2

Author(s):

Roberto Mosca ◽

Mingzheng Zha ◽

Davide Calestani ◽

Laura Lazzarini ◽

Giancarlo Salviati ◽

...

Keyword(s):

Gas Sensors ◽

Oxygen Vacancies ◽

Gas Sensing ◽

Oxide Nanowires ◽

Sensing Properties ◽

Sno2 Nanowires ◽

Gas Sensing Properties ◽

First Results ◽

Depth Study

AbstractSnO2 nanowires have been recently employed in the “gas-sensors” field and excellent results of conductometric and optical tests on SnO2 nanowires-based gas sensors have been reported.However, the mechanism that controls the gas-sensing effect in metal oxides nanowires is not fully understood yet. Here the authors present the first results of an in-depth study about the influence of post growth treatments on the physical and gas sensing properties of SnO2 nanowires.In particular, SnO2 nanowires grown by a vapour transport technique were annealed in a oxygen-rich atmosphere and then characterized by different techniques to assess the influence of the treatment on the nanowires properties.The annealing in oxygen atmosphere is shown to strongly affect the PL and CL spectra, the electrical resistivity as well as the gas sensing properties of the nanowires. The obtained results are consistent with a reduction of the oxygen vacancies concentration induced by the O2 treatment and seem to confirm the role of these defects in affecting the gas response of SnO2 nanowires-based sensors.

Download Full-text

Nanocrystalline Metal Oxides for Methane Sensors: Role of Noble Metals

Journal of Sensors ◽

10.1155/2009/861968 ◽

2009 ◽

Vol 2009 ◽

pp. 1-20 ◽

Cited By ~ 68

Author(s):

S. Basu ◽

P. K. Basu

Keyword(s):

Metal Oxide ◽

Metal Oxides ◽

Noble Metal ◽

Gas Sensors ◽

Noble Metals ◽

Industrial Applications ◽

Metal Catalyst ◽

Nanocrystalline Metal ◽

Sensing Properties

Methane is an important gas for domestic and industrial applications and its source is mainly coalmines. Since methane is extremely inflammable in the coalmine atmosphere, it is essential to develop a reliable and relatively inexpensive chemical gas sensor to detect this inflammable gas below its explosion amount in air. The metal oxides have been proved to be potential materials for the development of commercial gas sensors. The functional properties of the metal oxide-based gas sensors can be improved not only by tailoring the crystal size of metal oxides but also by incorporating the noble metal catalyst on nanocrystalline metal oxide matrix. It was observed that the surface modification of nanocrystalline metal oxide thin films by noble metal sensitizers and the use of a noble metal catalytic contact as electrode reduce the operating temperatures appreciably and improve the sensing properties. This review article concentrates on the nanocrystalline metal oxide methane sensors and the role of noble metals on the sensing properties.

Download Full-text