Growth solution C consisted of 90 mL 0.1 M CTAB, 2.5 mL selleck chemical Pazopanib 0.01 M HAuCl4, 0.5 mL 0.1 M ascorbic acid. The seed solution was added to growth solution A and shaken for 3 seconds. Then it was poured into solution B, shaken for 4 seconds and added to solution C. The mixture turned reddish in several minutes and was left overnight at room temperature. Excess CTAB was removed by centrifugation (Eppendorf MiniSpin, 1,000 rpm 5 min). Supernatant was removed and the pellet resuspended in water and stored in +4 ��C.2.5. Characterization of gold nanorods (GNR) with UV-Vis and Atomic Force Microscopy (AFM)The suspensi
Among different types of chemical gas sensors, metal oxide semiconductor (MOS) gas sensors are widely available and used in fabrication of gas monitoring and artificial olfactory systems [1,2].
As with other chemical gas sensors, the MOS group generally generates the output response based on trace of target gas (TG) in reaction to their sensing element, which, in turn, generates the output in terms of electrical conductivity variation. This trace generally depends on nature and concentration Inhibitors,Modulators,Libraries of the TG in a complicated way, which makes fabrication of a Inhibitors,Modulators,Libraries simple selective gas sensor difficult [3�C5]. Most of the reported efforts to fabricate a selective MOS gas sensor have generally focused on material Inhibitors,Modulators,Libraries modification and optimization. Applying a catalyst on the effective surface of MOS [6�C10], additive material [11�C19], or a combination of these methods [20] can affect the sensitivity and partially optimize the selectivity of the sensor.
Variation of thickness of sensitive film can also enhance partial selectivity of sensors [21,22].Besides mentioned studies on MOS gas sensors, so many other researches on different types of chemical gas sensors have been reported to achieve a perfect selective gas sensor. A major achievement of those efforts was to improve Inhibitors,Modulators,Libraries sensitivity and partial selectivity of chemical gas sensors. Fabrication of a single selective gas sensor, for use in a wide range of applications and detecting different TGs, is still difficult and most of the prototype products have been applied for hazard detection or monitoring level of contaminations.Since sensitivity of MOS gas sensor to particular TG is directly related to the operating temperature of the sensor [23], modulated-temperature methods along with some analyzing approaches have also been applied to enhance the selectivity.
Studies on a single gas sensor with temperature modulation have indicated the value of this selectivity even in complex gas mixtures [24�C30]. Employing an array of chemical gas sensors with improved sensitivity Cilengitide and partial selectivity, such as above presented MOS gas sensors, in electronic nose (e-nose) technology has solved the selectivity problem in different applications. Carfilzomib 868540-17-4 However, these methods (temperature modulation and e-nose) make the classification algorithm more complicated and some common problems occur similar to other methods.