Micromachined IR spectrometers for chemical sensing

... MICROMACHINED IR SPECTROMETERS FOR CHEMICAL SENSING LEE FEIWEN (B Eng (Hons.), NUS) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING DEPARTMENT ... transform infrared (FTIR) spectrometers based on MEMS technology, which has the potential to form a new generation of multi-component infrared chemical sensing system in the field of environmental ... (2.16) The first...

Ngày tải lên: 26/11/2015, 12:15

... APPLICATIONS OF OLIGOPEPTIDES AND LIQUID CRYSTALS FOR CHEMICAL SENSING DING XIAOKANG (M ENG., UNIV SCI & TECH BEIJING) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF ... phage library, and liquid crystals in sensing applications 13 Chapter 2.1 Sensing Layers Used in Sensors Most sensors consist of a sensing layer and a signa...

Ngày tải lên: 10/09/2015, 09:05

... INTRODUCTION ………………………………………… … 1.1 Applications of metal compounds for chemical sensing ………………… 1.2 Applications of cholesteric liquid crystals (CLCs) for chemical sensing … 1.3 Objectives ………………………………………………………………… ... ligands  affect  the 2  performance of metal compounds as molecular receptors for binding with VOCs.  1.2.  Applications of cholesteric liqui...

Ngày tải lên: 10/09/2015, 15:51

... the bottom of the pores can be attained through step-wise decrease of anodizing voltage, several steps of chemical etching and electroless deposition of nano-Au species at the bottom of alumina ... to Ua,fin; (ii) chemical etching in a solution of 0.5 M phosphoric acid at 30 °C for time sw and (iii) electroless deposition of zinc/nickel layer in the im...

Ngày tải lên: 22/06/2014, 22:20

... recipients of IND drugs, medical monitoring and reporting of the use of such drugs, information about shipment and storage of drugs, disposition of unused IND drugs, and submission of annual and other ... changes in the Office of the Secretary of iii iv The Acquisition of Drugs and Biologics for CBW Defense Defense (OSD) to centralize the au...

Ngày tải lên: 17/02/2014, 11:20

... other words from this online nonparallel, comparable corpus of newspaper materials We choose to use issues of the English newspaper Hong Kong Standard and the Chinese newspaper Mingpao, from Dec.12,97 ... almost all unambiguous Chinese new words find their translations in the first 100 of the ranked list Six of the Chinese words have correct translation as their first candidat...

Ngày tải lên: 08/03/2014, 05:21

... analyte solution and silicon nanowires 2.2 Surface modification The silicon wire FET sensor is modified with urease following procedure below Before modification, the Al2 O3 surface was treated with ... plasma [14] (50 mW power, 30 sccm flow rate for min) for two purposes One is for cleaning the sample surface, and the other one is for generating a hydrophilic surface The wires...

Ngày tải lên: 16/03/2014, 15:25

... the electrical and gas sensing behavior of ZnO nanowires Fig Characteristics of In3 O2 nanowires: (a) SEM image of In3 O2 nanowires, (b) TEM image of nanowire 70 nm in width, and (c) ED pattern ... image of a nanowire, and (e) linescan of the HAADF signal (solid line) and numerical fit of the shape of the nanowire (dashed line) As both composition and phase ca...

Ngày tải lên: 16/03/2014, 15:25

... properties of metal oxides (4, 12–14) Chemical and biological sensors having nanostructured metal oxides and especially metal- oxide nanowires benefit from the comprehensive understanding that exists ... direction, one can expect to see the onset of progressively more significant quantum effects (32) Surface Reactions on One- Dimensional Oxides, Gas Sensing, and Catalysis...

Ngày tải lên: 19/03/2014, 16:47

... candidate of gas-sensing applications [15–17] For the gas-sensing materials, there are various approaches using CNTs as the solution such as CNTs for dispersion, CNTs for composite, CNTs for filling, ... indicate SnO2 rutile peaks and dash lines indicate TiO2 rutile peaks Table The interplanar spacing values of SnO2 TiO2 mixed oxide calculated by Vegard’s law are close to t...

Ngày tải lên: 20/03/2014, 13:04

... the mother phase of the nanosize dimension derivatives applied for sensing layers is shown This morphology seems to be promising as a precursor for sensing layers with nanosize dimension grains ... A K., Pfeifer, J., T´ th, A L and Gouma, P I., a o Wet chemical synthesis of nanosize tungsten oxide for sensing applications In Proceedings of the First International Works...

Ngày tải lên: 20/03/2014, 13:05

... focus on suspended Porous Silicon microhotplates Results Characterization of the gas sensors was performed at isothermal mode of operation, by keeping constant the power supplied to the heater For ... micro-hotplates were used for low power consumption Characterization of gas sensors was performed for various NH3 concentrations and operating temperatures, using isothermal mode...

Ngày tải lên: 20/03/2014, 13:05

... could be formed during the process of interruption The prolongation of film growth on the “extra” interface involves a new nucleation of the metal oxide film, the formation and growth of a film ... of the sensors heavily depend on the conditions and methods used in their preparation [27–31] Since grain size is one of the key factors to enhance the gas sensing properties of...

Ngày tải lên: 20/03/2014, 13:05

... employed The system allows for sample rotation (360◦ ) and sample inclination (90◦ ) 2.4 Gas sensing measurements The gas sensing properties of the different hybrid active materials produced were ... higher amount of SnO2 than WO3 is present in the hybrid materials 3.2 Gas response analysis The gas sensing properties of the different hybrid materials produced were...

Ngày tải lên: 20/03/2014, 13:05