494 Works

P2NG.16 - Spontaneous Deposition of Cobalt Oxide Nanoplates for Application to Acetone Gas Sensors

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The development of sensing materials, which influence the practical gas sensing performance, is critically important for the further evolution of semiconducting metal oxide gas sensor. Especially, cobalt oxides have attracted great interest in their potential applications as solid-state sensors because of their chemical stability and semiconducting properties. In this study, we are reporting the spontaneous deposition of Co3O4 nanoplates on interdigitated electrodes and its application to gas sensors. Inducing the phase transition of h-CoO to...

BS4.4 - TiO2 Nanorod-based Photoelectrochemical Sensor for Alzheimer's Disease Detection

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In this research. TiO2 nanorods was fabricated on FTO/glass as electrode for the immobilized of Alzheimer’s disease antibody by using 3-mercaptopropionic acid (MPA). Then, cyclic voltammetry method was used to test the current response to Alzheimer’s disease peptide. The result shows that biggest change of current could nearly 2 μA. The light on/off cycle of illumination by LED with different wavelength was performed in Faraday cage to evaluate the photo response. With illumination by wavelength...

P2NG.20 - Gas Sensitivity of the surface potential of Pyrene Coated ZnO Nanorods

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Organically capped metal oxide nanostructures offer an interesting combination of chemical and physical sensitivities. In particular, the sensitivity to light and to gases have been shown to cooperate in order to strength each other. In this paper, we studied the properties of pyrene tetratopic ligands (PTL) and ZnO nanorods. After structural and morphological characterizations of the nanohybrid materials, mutual cooperation of selectivity to visible light and to volatile organic compounds (VOCs) is investigated measuring the...

OL.1 - Applications of Soft Chemical Ionisation Mass Spectrometric Instrumentation to Investigate the Human Volatilome for use in the Medical Sciences

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Soft chemical ionization mass spectrometric techniques, which include proton transfer reaction mass spectrometry and ion mobility spectrometry, employ ions as sensitive analytical probes for use in the identification, detection and monitoring of trace compounds in complex chemical surroundings. These techniques have opened up new and exciting possibilities for applied areas of research with applications to health, food science, the environment and security. Among these is the potential to use the trace volatiles in human breath,...

OL.2 - Olfaction as Sensors and Actuators

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Functionality of sensors and actuators in smart portable devices plays an important role in corresponding to five senses of human, enhancing user convenience, and enriching user experience. The human sense of small (olfaction) is perhaps the most interesting and yet is understood the least. A human interface for olfaction is composed of an odor sensing and olfactory display system. There is considerable need for a system that could mimic the olfaction and to use for...

BS6.2 - Biocompatible Gold Nanoclusters as Turn-off Biosensors

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Noble metal nanoparticles vs. nanoclusters The well-known biomolecules (eg. peptide, amino acid, nucleotide, etc.) are suitable for both direct preparation and stabilization of plasmonic Au NPs but the weight or molar ratios of the reactants have dominant role on the size and the optical feature. ...

BS6.3 - A label-free assay for sensitive detection of trypsin by using gold nanoclusters as fluorescent probes

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Herein, we designed a convenient and label-free fluorescence nanosensor for sensitive detection of trypsin (TRY). The fluorescence of gold nanoclusters (AuNCs) could be quenched by cytochrome c (Cyt c) via electron transfer (ET) mechanism. However, TRY specifically catalyzes the hydrolysis of Cyt c to small peptide fragments, causing sufficient recovery of fluorescent signal. The proposed system displayed a sensitive and selective response to TRY in the range from 0.2 to 100 µg mL-1, with a...

P2MM.7 - Host-Guest Interaction of Anthraldehyde Dithiosemicarbazone and Construction of Molecular Logic Gates

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Novel anthraldehyde based dithiosemicarbazide chemosensor was synthesized and characterized for the selective optical and naked eye recognition of copper, fluoride and cyanide ions. The receptor shows fluorescence ON-OFF behaviour with Read-Erase-Write-Read property when an alternative addition of Cu2+ and F-, which results the INHIBIT logic gate at the molecular level. While comparing the optical properties of the receptor with the presence of individual ions and a combination of the ions, the construction of molecular logic...

GS5.2 - Enhanced Gas sensing by Double-Shell V2O5 Hollow Nanospheres Functionalized with PdO Nanoparticles

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Double-shell V2O5 hollow nanospheres decorated with PdO nanoparticles were synthesized via a template-free hydrothermal method combined with subsequent annealing process. The chemical composition and microstructure evolution were examined using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and transmission electron microscope (TEM). The sensing properties of V2O5 hollow nanospheres before and after functionalization with PdO nanoparticles were investigated. The PdO-loaded Fe2O3 sensor exhibited obviously enhanced response to acetone compared with their unloaded...

P2MM.8 - Conduction Activation Energy in PEDOT:PSS Thin Films

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Conductive polymer PEDOT:PSS has been used for the fabrication of humidity and VOC sensors. The electrical conduction mechanism in this polymer is established, but the reported conduction activation energy (Ea) values vary in a wide range. Here, we report measuring Ea in different PEDOT:PSS samples and show that, indeed, Ea varies with the sample thickness and the relative humidity (RH) in the surrounding atmosphere. The results are explained by the assumption of multiple carrier excitation...

DH2.6 - Acetone Bio-sniffer (YSZ-based Electrochemical Gas Phase Biosensor) toward Diagnosis of Diabetes

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Acetone bio-sniffer, because of its ability of continuous non-invasive monitoring, is recognized as a potential method for the diagnosis of diabetes. In this study, mixed potential electrochemical sensors based on YSZ and K2NiF4 -type oxides Sm2-xSrxNiO4 (x= 0.4, 0.6 and 0.8) sensing electrode were fabricated as bio-sniffer for diagnosis of diabetics by detecting acetone concentration in exhaled breath. The results showed that when Sm1.4Sr0.6NiO4 was used as sensing material, the fabricated sensor exhibited the best...

AP1.5 - W-Sn Mixed Oxides for Selective Detection of NO2

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Tungsten-tin mixed oxides at increasing Sn molar fraction (0.1, 0.3 and 0.5) were synthesized by solgel co-precipitation route. The prepared powders were characterized by electron microscopy (SEM and TEM), X-ray diffraction, specific surface area measurements (BET), UV-Vis-NIR and IR spectroscopies. It turned out that the mixed materials W-Sn(0.1) and W-Sn(0.3) form a solid solution with WO3 crystal structure without phase segregation, achieving the goal to reduce the WO3 grain growth with temperature. The prepared powders...

NG.2 - Synthesis of amino-functionalized MIL-101(Cr) as high performance HF gas sensor

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Metal-organic frameworks have attracted much attention because of their potential applications in many fields such as catalysis, adsorption, sensors, and environmental remediation due to their controllable composition, structure and pore size. In this work,The Amino-functionalized metal-organic framework NH2-MIL-101(Cr), Containing 2-aminobenzene-1,4-dicarboxylate as the linker, has been synthesized. The morphologies, microstructures and compositional characteristics of the NH2-MIL- 101(Cr) were sufficiently examined by X-ray diffraction (XRD), nitrogen sorption analysis, scanning electron microscopy (SEM), and transmission electron microscope (TEM)....

NG.3 - Room Temperature High Performance NH3 Sensor:In Situ Growth Polyaniline Nanofibers Decorated by SnO2 on Flexible PET Substrate

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The polyaniline (PANI) nanofibers based chemical sensors assembled on flexible PET substrate are the current research hotspot, because of its low cost, flexible design and room temperature detection. In order to further enhance the gas sensing properties, the preparation of hybrid materials with semiconducting metal oxides (SMOs) decorate PANI to the formation of heterojunction structure is an effective strategy. Herein, we presented PANI decorated by SnO2 (PAS) hybrid by in-situ chemical oxidative polymerization method. The...

BS4.1 - Bio- and chemosensors based on the thermal boundary resistance at solid-liquid interfaces

This contribution will give an overview on a recently developed sensing principle, the Heat-Transfer Method HTM. In analogy with impedance spectroscopy that employs capacitive- or Faradaic electrical currents, HTM operates with thermal currents that pass the interface between a functionalized sensor chip and the supernatant liquid. The thermal resistance Rth of the interface is highly sensitive to the conformation of the functional layer and/or to its binding state with target molecules. HTM applications till date...

BS4.2 - Label-free detection of nucleic acids and proteins using impedance spectroscopy and surface plasmon resonance

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Label-free technologies have gained increasing interest in sensing. The presentation focuses on the use of impedance measurements for the analytical detection of nucleic acids including abasic DNA and DNA-binding proteins. It will show how pitfalls can be avoided by elimination of drift phenomena. Furthermore, it will illustrate the usefulness of surface plasmon resonance in the detection of conformational changes and the discrimination of two rather similar proteins.

AP1.6 - Photo-activated NO2 Sensors with 1-D nanomaterials Integrated with Micro-LED for High Irradiation Efficiency

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In this paper, we propose a photo-activated metal oxide gas sensor integrated with a commercial μ-LED (λpeak = 390 nm) for high photo-irradiation efficiency. The sensing materials, ZnO nanowires or SnO2 nanotubes, were grown on parallel electrodes of Indium Tin Oxide (ITO) patterned on a quartz substrate. The transparency of the ITO electrodes and the quartz substrate allowed the UV LED to be placed beneath the quartz substrate to irradiate the grown nanomaterial, thereby resulting...

P2NG.23 - CuO-Loaded Porous SiO2 Fibers for H2S Detection

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We present a new functional material as sensing layer for hydrogen sulfide (H2S) detection. The sensing mechanism is based on percolation effects in the cupric oxide (CuO) – copper(II)sulfide (CuS) system. By rational design of CuO/SiO2 nano-composite fibers structural stabilization during CuO-CuS phase change can be achieved. This leads to significant improvement in the cycle stability of this new sensor type. A detailed study of the synthesis and the influence of its various parameters on...

P1NM.4 - Cu/Cu2O Nanocomposites for Sensitive Detection of Hydrogen Peroxide

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In this work, Cu/Cu2O nanocomposites were prepared by potential oscillation. The composition and morphology of Cu/Cu2O nanocomposites were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy and X-ray photoelectron spectroscopy. The Cu/Cu2O/FTO electrode showed super electrocatalytic activity for hydrogen peroxide (H2O2) oxidation because of the synergistic effects of Cu and Cu2O. The electrocatalytic performance of Cu/Cu2O/FTO was evaluated by linear sweep voltammetry and amperometry. Electrochemical studies showed that the developed biosensor exhibited a wide...

P1NM.8 - Ultrasensitive RGO/Cu2O film synthetized by hydrothermal method to detect NO2 gas at room temperature

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Advancing researches had been focused on incorporating RGO with metal oxidize to improve the gassensing sensitivity. In this paper, a neural-like RGO/Cu2O composites was synthetized with a facile hydrothermal method. two crystalline morphology nanoparticles and nanowires existed as one integral morphology. The materialsʼ ultrasensitive property could achieve nearly 35 % at 50 ppb NO2 level at room temperature. Chemical reaction factors such as temperature, PH, ions concentration (reactant and reductant included) had been considered to...

P1NM.9 - Ultra-Sensitive Formic Acid Gas Sensor Based on Zn-doped SnO2 Nanoparticles Prepared by Flame Spray Pyrolysis

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Volatile Organic Acids (VOA) are organic compounds with acidic properties. The most common organic acids are the carboxylic-based acids, including formic acid, acetic acid, lactic acid and propionic acid. Specifically, formic acid detection is an effective carrier for hydrogen production widely used in many applications including medicine, pesticide, organic synthesis, and tannery industry [1, 2]. Although the leakage in formic acid processing could not be detected at the very first time, it may affect seriously...

P1GS.11 - Enhanced NO2 response of surface decorated WO3 lowcost gas sensors

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The aim of this work is to enhance the electrical responses of low-cost WO3 chemo-resistive gas sensors to sub-ppm NO2 gas concentration through doping with different concentrations of Y2O3. Y2O3 surface decorated WO3 gas sensors were prepared by screen-printing and annealed at 800 ˚C. X-ray Diffractometry (XRD) and Scanning Electron Microscopy (SEM) were used to study the phase evolution and morphology of fabricated films, respectively. Results showed that Y2O3 nanoparticles are well dispersed within the...

P1GS.1 - Room Temperature UV-Enhanced NO2-Gas Sensing of Doped and Undoped Sol-Gel-Synthesized ZnO

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ZnO is of interest for many applications, e.g. also for gas sensing. Here, sol-gel synthesized, nanosized ZnO is investigated with regard to its room temperature NO2 sensing behavior. It is shown that both doping and UV exposure shorten the response and the recovery times of the sensors. NO2 measurements were carried out with undoped, Sn-doped, and Al-doped ZnO sensors, respectively. The Al-doped samples provide the highest NO2-response. Furthermore, the effect of dry or humid atmosphere...

P1OS.11 - Study on Absorption of VOCs into PDMS Film using Heterodyne Interferometry for Application of VOCs Sensing.

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A heterodyne interferometer using a Mach-Zehnder optical configuration is designed for detection of airborne VOCs. The design is based on film-mediated sensing technique in which the response of intermediate sensing film is monitored using interferometry. PDMS is used as a sensing film, which changes its volume and refractive index when absorbed VOCs molecules. Thin film of PDMS acts as a phase object and any variation in its state causes a proportional phase shifts in the...

P1GS.4 - Correlation between the NO2 gas sensing properties and surface area of ZnO nanofibers, hyerarchical and thin films structures

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Aim of this work is to assess relationships between sub-ppm NO2 gas relative response (RR= Rg/Ra) and absolute surface area evolution of: ZnO nanofibers (ZnO-NF), nanofiber-nanowire brush like ZnO (ZnO-NB) and ZnO thin film (ZnO-TN). In a first step ZnO-NFs mats with two different amounts of fibers (LD-ZnO, HD-ZnO, i.e. low and high fiber density), have been initially characterized both as respect to their absolute surface area and to NO2 gas response (20ppb – 1ppm)....

Registration Year

  • 2018
    494

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