scholarly journals Molecular nanocrystals grown in sol-gel thin films for ultrabright chemical sensor applications

2006 ◽  
Author(s):  
V. Monnier ◽  
N. Sanz ◽  
M. Bacia ◽  
R. Pansu ◽  
A. Ibanez
Keyword(s):  
Thin Films ◽  
Chemical Sensor ◽  
Sol Gel ◽  
Sensor Applications

Functionalized polysiloxane thin films deposited by matrix-assisted pulsed laser evaporation for advanced chemical sensor applications

2006 ◽  
Vol 252 (13) ◽  
pp. 4871-4876 ◽  
Author(s):  
E.J. Houser ◽  
D.B. Chrisey ◽  
M. Bercu ◽  
N.D. Scarisoreanu ◽  
A. Purice ◽  
...  
Keyword(s):  
Thin Films ◽  
Chemical Sensor ◽  
Pulsed Laser ◽  
Laser Evaporation ◽  
Sensor Applications

Ceramic Materials for Mass-Sensitive Sensors - Detection of VOCs and Monitoring Oil Degradation

2006 ◽  
Vol 45 ◽  
pp. 1799-1802 ◽  
Author(s):  
Peter A. Lieberzeit ◽  
Gerd Glanznig ◽  
Anton Leidl ◽  
Franz L. Dickert
Keyword(s):  
Chemical Sensor ◽  
Sol Gel ◽  
Ceramic Materials ◽  
Oil Degradation ◽  
Phase Measurements ◽  
Sensor Applications ◽  
Enhanced Sensitivity ◽  
Wave Oscillator ◽  
Quartz Substrates ◽  
Micro Balance

Inorganic frameworks obtained by the sol-gel route can be templated by a molecular imprinting (MIP) approach to generate functional cavities. Such MIP ceramics show highly appreaciable properties for chemical sensor applications, because they are inherently chemically and thermally robust. In combination with mass-sensitive devices (e.g. quartz crystal micro balance – QCM, surface transverse wave oscillator - STW), they yield highly selective and sensitive chemical sensors. Gas phase measurements with volatile organic compounds (VOCs) e.g. lead to sensitivities below 1 ppm. Sensitivity can be tuned by the sol-gel-precursor: when hydrolysing more bulky alkoxides, this leads to enhanced sensitivity by increasing porosity as a consequence of slower solvent evaporation. By adding products of oxidative oil degradation to the sol-gel mixture, we succeeded in generating sensors for degradation processes in these complex matrices. This allows parallelly monitoring both the chemical state of oil and changes in viscosity. Sensitivity is enhanced according to the Sauerbrey equation by going from 10 MHz QCM transducers to higher frequencies either by etching the quartz substrates and so reducing the resonator thickness or by applying STWs.

TiO2 thin films by a novel sol–gel processing for gas sensor applications

2000 ◽  
Vol 68 (1-3) ◽  
pp. 189-196 ◽  
Author(s):  
C Garzella ◽  
E Comini ◽  
E Tempesti ◽  
C Frigeri ◽  
G Sberveglieri
Keyword(s):  
Thin Films ◽  
Gas Sensor ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Sensor Applications ◽  
Gel Processing

Sol-Gel Preparation and Characterization of Niobia thin Films for Catalytic Sensor Applications

1994 ◽  
Vol 346 ◽  
Author(s):  
Rosibel Ochoa ◽  
Raul Miranda
Keyword(s):  
Thin Films ◽  
Gas Sensors ◽  
Sol Gel ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Sensor Applications ◽  
Donor Acceptor ◽  
Gel Preparation ◽  
Niobium Ethoxide

ABSTRACTThin films of niobium pentoxide were deposited on quartz plates by spin-coating a solution of niobium ethoxide in ethanol. The films were tested as potential selective gas sensors by exposing them to various reducing environments. It was found that they were selective and sensitive to ammonia. This sensitivity was attributed to the formation of donor-acceptor complexes between chemisorbed ammonia and Lewis acid sites on the solid.

Harmonic Excitation of Surface Acoustic Waves on Gallium Nitride Thin Films for Biological and Chemical Sensor Applications

2012 ◽  
Vol 1415 ◽  
Author(s):  
J. Justice ◽  
L. E. Rodak ◽  
K. Lee ◽  
L. A. Hornak ◽  
D. Korakakis
Keyword(s):  
Thin Films ◽  
Gallium Nitride ◽  
Acoustic Waves ◽  
Chemical Sensor ◽  
Surface Acoustic Waves ◽  
Cost Effective ◽  
Harmonic Excitation ◽  
Higher Harmonics ◽  
Sensor Applications ◽  
Saw Devices

ABSTRACTGallium nitride (GaN) is a robust piezoelectric semiconductor with excellent thermal and chemical stability, making it an attractive material for surface acoustic wave (SAW) sensors operating in high temperature and harsh environments. The sensitivity of SAW devices is proportional to the square of the operating frequency. Therefore, high operating frequencies into the GHz regime are desirable for SAW sensors. For GaN, this requires sub-micron interdigital transducers (IDTs) when devices are designed to operate at the fundamental Rayleigh mode frequency. The necessity for sub-micron IDTs can increase fabrication costs and complexity. By designing SAW devices to operate at harmonic frequencies, GHz operation can be realized with relatively large IDTs, resulting in simpler and more cost effective solutions for GaN based SAW sensors. Devices have previously been designed to operate at the 5th and higher harmonics on lithium niobate, but there are no reports of using this technique on GaN in the literature. In this study, GaN thin films have been grown via metal organic vapor phase epitaxy on sapphire substrates. SAW devices designed to operate at the fundamental frequency and higher harmonics have been fabricated and measured. Operating frequencies greater than 2 GHz have been achieved using IDTs with 5 μm fingers. In addition, reduction of electromagnetic feedthrough around the 5th and 7th harmonic is demonstrated through varying ground electrode geometries.

Laser processing of polymer thin films for chemical sensor applications

2003 ◽  
Vol 163-164 ◽  
pp. 293-299 ◽  
Author(s):  
A Piqué ◽  
R.C.Y Auyeung ◽  
J.L Stepnowski ◽  
D.W Weir ◽  
C.B Arnold ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Processing ◽  
Chemical Sensor ◽  
Polymer Thin Films ◽  
Sensor Applications

Recent progress in pillar[n]arene-based thin films on chemical sensor applications

2021 ◽  
Author(s):  
Yaser Acikbas ◽  
Mehmet Aksoy ◽  
Merve Aksoy ◽  
Damla Karaagac ◽  
Elif Bastug ◽  
...  
Keyword(s):  
Thin Films ◽  
Recent Progress ◽  
Chemical Sensor ◽  
Sensor Applications
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