This paper reports the decoration of single wall carbon nanotubes (SWCNTs) with platinum (Pt) nanoparticles using an electrochemical technique, rotating disk slurry electrode (RoDSE). Pt/SWCNTs were electrochemically characterized by cyclic voltammetry technique (CV) and physically characterized through the use of transmission electron microscopy (TEM), energy dispersive spectroscopy - X-ray florescence (EDS-XRF) and X-ray diffraction (XRD). After characterization it was found that electrodeposited nanoparticles had an average particle size of 4.1 ± 0.8 nm. Pt/SWCNTs were used as sensing material for methane (CH4) detection and showed improved sensing properties in a range of concentration from 50 ppm to 200 ppm parts per million (ppm) at room temperature, when compared to other Pt/CNTs-based sensors. The use of this technique for the preparation of Pt/SWCNTs opens a new possibility in the bulk preparation of samples using an electrochemical method and thus their potential use in a wide variety of applications in chemical sensing, fuel cell and others.
A gas sensor is a device that when exposed to gaseous species, is able to alter one or more of its physical properties, so that can be measured and quantified, directly or indirectly. These devices are used for applications in homeland security, medical diagnosis, environmental pollution, food processing, industrial emission, public security, agriculture, aerospace and aeronautics, among others. Desirable characteristics of a gas sensor are selectivity for different gases, sensitivity at low concentrations, fast response, room temperature operation some applications may require high temperature , low power consumption, low-cost, low maintenance and portability. Traditional techniques like gas chromatography GC , GC coupled to mass spectrometry GC-MS , Fourier transmission infrared spectroscopy FTIR and atomic emission detection AED provide high sensitivity, reliability and precision, but they are also bulky, time consuming, power consuming, operate at high temperature, and the high maintenance and requirement of trained technicians translate in high costs. In an effort to overcome those disadvantages, research in the area has been focused on the search for functional sensing materials.Carbon nanotubes CNTs have been have been focus of intense research as alternative sensing material because of their attractive characteristics like chemical, thermal and mechanical stability, high surface area, metallic and semi-conductive properties and functionalization capability [ ]. CNTs are graphene sheets rolled in a tubular fashion. Different types of CNTs can be synthesized single walled carbon nanotubes SWCNT , double wall carbon nanotubes DWCNTs and multi walled carbon nanotubes MWCNT .The publication of the first CNT-based sensor for NH and NO detection using an individual semiconducting SWCNT [ ] triggered the research activity in this area. Pristine CNTs have shown to be chemically inactive to gas molecules in general. However, their modifica-
The work presented here is a nanosensor array -based detector system for real time, in-situ sensing of trace chemicals in the environment. The nanosensor array is integrated with a cellphone to utilize the cell phone communication system for wireless and network sensing via 3G and/or Wi-Fi. This sensing system is compact, low cost, low power, and high-speed. This system is also called a tetracorder that can detect chemicals, humidity, temperature, and pressure at the same time. The advantages of using this tetracorder (a phone-sensor) are: 1) it can give an early warning when a chemical event occurred, 2) they are small, self contain, and portable for easy carry-on, 3) the measurement result can be sent to the control center right away, 4) it can provide the location information for tracking the source of an event, 5) it can provide the environmental information with the chemical detection for helping the judgment of the real situation. Nomenclature SWCNT = Single Wall Carbon Nanotube CNT = Cabon Nanotube IDE = Interdigitated Electrode PCB = Printed Circuit Board COTS = Commercial off the Shelf App = Application software DSP = Digital Signal Processing SVM = Support Vector Machine PCA = Principal Component Analysis RMSE = Residual Mean Square Error DMMP = Dimethyl Methyl Phosphate OSHA = Occupational Safety and Health Administration PEL = Personal Exposure Limit ppmv = Parts per million by volume ppbv = Parts per billion by volume
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