| 1. |
|
|
| 2. |
- Cioffi, Nicola, et al.
(author)
-
Electrosynthesis and characterization of gold nanoparticles for electronic capacitance sensing of pollutants
- 2011
-
In: Electrochimica Acta. - : Elsevier Science B.V., Amsterdam.. - 0013-4686 .- 1873-3859. ; 56:10, s. 3713-3720
-
Journal article (peer-reviewed)abstract
- In the present study, gold/surfactant core/shell colloidal nanoparticles with a controlled morphology and chemical composition have been obtained via the so-called sacrificial anode technique, carried out in galvanostatic mode. As synthesized Au-NPs had an average core diameter comprised between 4 and 8 nm, as a function of the electrochemical process experimental conditions. The UV-Vis characterization of gold nanocolloids showed clear spectroscopic size effects, affecting both the position and width of the nanoparticle surface plasmon resonance peak. The nanomaterial surface spectroscopic characterization showed the presence of two chemical states, namely nanostructured Au(0) (its abundance being higher than 90%) and Au(I). Au-NPs were then deposited on the top of a capacitive field effect sensor and subjected to a mild thermal annealing aiming at removing the excess of stabilizing surfactant molecules. Au-NP sensors were tested towards some gases found in automotive gas exhausts. The sensing device showed the largest response towards NOx, and much smaller - if any - responses towards interferent species such as NH3, H-2, CO, and hydrocarbons.
|
|
| 3. |
- Ieva, Eliana, et al.
(author)
-
Au Nanoparticles as Gate Material for NOx Field Effect Capacitive Sensors
- 2008
-
In: Sensor letters. - : American Scientific Publishers. - 1546-198X .- 1546-1971. ; 6:4, s. 577-584
-
Journal article (peer-reviewed)abstract
- Gold nanoparticles (Au-NPs) are electrochemically synthesized in the presence of tetra-alkylammonium stabilizers and used as active element in Field Effect capacitive gas sensors. Before use, the sensing area is treated by a relatively mild annealing procedure aimed to partially remove the organic stabilizer without loosing the nano-structured character of the particles. Both pristine and annealed materials have been subjected to a spectroscopic and morphological characterization (by means of UV-Vis, XPS, TEM, SEM techniques). Preliminary results on the application of AuNPs as gate material for NO, sensing are reported. The sensor is able to detect NO, with appreciable selectivity and low response towards the other tested gases (C3H6, CO, H-2, NH3).
|
|
| 4. |
- Ieva, Eliana, 1979-, et al.
(author)
-
Gold Nanoparticle Sensors For Environmental Pollutant Monitoring
- 2007
-
In: Proceedings of the 2007 2nd IEEE International Workshop on Advances in Sensors and Interfaces, June 26-27, 2007 Bari, Italy. - : IEEE. - 9781424412457 - 9781424412457 ; , s. 1-4
-
Conference paper (other academic/artistic)abstract
- Gold nanoparticles (Au-NPs) have been synthesised using a sacrificial anode electrolysis in the presence of tetra-alkyl-ammonium halides, employed as cationic stabilizers. Catalytic NPs have been then deposited on top of Field Effect (FE) gas sensing devices and subjected to mild annealing procedures. Transmission Electron Microscopy (TEM) shows that the NP average core diameter is around 5 nm. X-Ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscopy (SEM) have been applied to the surface characterization of the annealed NP films used as active sensing layers. Morphological and spectroscopic results demonstrate that the annealed inorganic nano-clusters are finely dispersed and maintain a metallic oxidation state. Au-NPs can be proficiently employed as gate material in Si-Field Effect Gas Sensors. Preliminary results show interesting selectivity and sensitivity sensing features towards NOx detection.
|
|
| 5. |
|
|
| 6. |
- Lutic, D, et al.
(author)
-
Catalytic properties of oxide nanoparticles applied in gas sensors
- 2007
-
In: Topics in Catalysis. - : Springer Science and Business Media LLC. - 1572-9028 .- 1022-5528. ; 45:1-4, s. 105-109
-
Journal article (peer-reviewed)abstract
- A series of gas sensing layers based on indium oxide doped with gold were prepared by using the aerosol technology for deposition as the active contact layer in a metal oxide semiconductor capacitive device. The interaction between the measured species and the insulator surface was quantified as the voltage changes at a constant capacitance of the device. The sensor properties were investigated in the presence of H2, CO, NH3, NO, NO2 and C3H6 at temperatures between 100–400 °C. Significant differences in the morphology of the layer and its sensitivity were noted for different preparation methods and different gas environments.
|
|
| 7. |
- Torsi, Luisa, et al.
(author)
-
Organic thin-film transistors for inorganic substance monitoring
- 2009. - 1
-
In: Organic electronics in Sensors and Biotechnology. - New York : McGraw-Hill Companies Inc. - 9780071596756 ; , s. 51-91
-
Book chapter (other academic/artistic)abstract
- Develop high-performance, field-deployable organic semiconductor-based biological, chemical, and physical sensor arrays using the comprehensive information contained in this definitive volume. Organic Electronics in Sensors and Biotechnology presents state-of-the-art technology alongside real-world applications and ongoing R & D.Learn about light, temperature, and pressure monitors, integrated flexible pyroelectric sensors, sensing of organic and inorganic compounds, and design of compact photoluminescent sensors. You will also get full details on organic lasers, organic electronics in memory elements, disease and pathogen detection, and conjugated polymers for advancing cellular biology.Monitor organic and inorganic compounds with OFETsCharacterize organic materials using impedance spectroscopyWork with organic LEDs, photodetectors, and photovoltaic cellsForm flexible pyroelectric sensors integrated with OFETsBuild PL-based chemical and biological sensing modules and arraysDesign organic semiconductor lasers and memory elementsUse luminescent conjugated polymers as optical biosensorsDeploy polymer-based switches and ion pumps at the microfluidic level
|
|
