The Experts below are selected from a list of 28539 Experts worldwide ranked by ideXlab platform
Tung-ming Pan - One of the best experts on this subject based on the ideXlab platform.
-
Comparison of CeTiO 3 and Ce 2 TiO 5 Sensing Films for pH Sensors
IEEE Electron Device Letters, 2018Co-Authors: Tung-ming Pan, Yen-hsiang Huang, Jim-long Her, Bih-show Lou, Sheng-han Tsai, See-tong PangAbstract:In this letter, we compared the structural and Sensing properties of CeTiO3 and Ce2TiO5 Sensing Films for electrolyte–insulator–semiconductor (EIS) pH sensors. The structural behavior of these Sensing Films was characterized by Auger electron spectroscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. In comparison with CeTiO3 Sensing Film, the EIS sensor using a Ce2TiO5 Sensing Film exhibited better Sensing performance including higher sensitivity (68.35 mV/pH), lower hysteresis voltage (0.9 mV), and smaller drift rate (0.19 mV/h), presumably suggesting this Film possessing a high fraction of Ce3+ and a rough surface.
-
Effect of Sensing Film Thickness on Sensing Characteristics of Dual-Gate Poly-Si Ion-Sensitive Field-Effect-Transistors
IEEE Electron Device Letters, 2014Co-Authors: Li-chen Yen, Ming-tsyr Tang, Chia-ying Tan, Tung-ming Pan, Tien-sheng ChaoAbstract:We investigate the effect of Sensing Film thickness on the Sensing characteristics of dual-gate (DG) poly-Si ion-sensitive field-effect transistors (ISFETs). The pH sensitivity (from 37.57 to 9.32 mV/pH) of the DG poly-Si ISFET device degrades with the increase in the Sensing Film thickness (from 20 to 120 nm), whereas hysteresis voltage (from 6.7 to 1.12 mV for a neutral to acid to alkaline to neural loop) and drift rate (from 13.47 to
-
Structural properties and Sensing characteristics of high-k Ho2O3 Sensing Film-based electrolyte–insulator–semiconductor
Materials Chemistry and Physics, 2011Co-Authors: Tung-ming Pan, Ming-de HuangAbstract:Abstract In this study, we report a Ho 2 O 3 electrolyte–insulator–semiconductor (EIS) device Films deposited on Si substrates through reactive sputtering. The effect of thermal annealing (700, 800, and 900 °C) on the structural and surface properties of Ho 2 O 3 Sensing Film was investigated by X-ray diffraction, X-ray photoelectron spectroscopy, and atomic force microscopy. We found that the EIS device with a Ho 2 O 3 Sensing Film annealed at 800 °C exhibited a higher sensitivity of ∼57 mV/pH, a lower hysteresis voltage of 2.68 mV, and a smaller drift rate of 2.83 mV h −1 compared to those at other annealing conditions. This improvement can be attributed to the well-crystallized Ho 2 O 3 structure and the large surface roughness.
Abliz Yimit - One of the best experts on this subject based on the ideXlab platform.
-
planar optical waveguide based dimethylamine sensor with cresol red tio 2 composite thin Film
Journal of The Optical Society of America B-optical Physics, 2020Co-Authors: Nuerguli Kari, Lili Wang, Patima Nizamidin, Shawket Abliz, Abliz YimitAbstract:A planar optical glass-slide-based dimethylamine (DMA) sensor was fabricated with composite thin Film of cresol red and titanium dioxide as the Sensing layer and tin-diffused planar glass slide as the substrate. The UV-visible spectrum before and after analyte exposure was investigated to detect the color transformation of Sensing layer and to select a laser light source wavelength (532 nm). DMA detection response along with time were performed on an optical waveguide system at room temperature. Experimental results show that this Sensing Film had not only fast response (6 s) but also rapid recovery (21 s) (${0.004}\;{{\rm mg/m}^3}$0.004mg/m3). Besides, detection is available for DMA solution as low as ${0.0008}\;{{\rm mg/m}^3}$0.0008mg/m3 concentration with signal-to-noise ratio (S/N) 5.29. The Sensing Film is stable for one month at ambient temperature, and the response reaction is reversible.
-
Planar optical waveguide-based dimethylamine sensor with cresol red/TiO 2 composite thin Film
Journal of the Optical Society of America B, 2020Co-Authors: Nuerguli Kari, Lili Wang, Patima Nizamidin, Shawket Abliz, Abliz YimitAbstract:A planar optical glass-slide-based dimethylamine (DMA) sensor was fabricated with composite thin Film of cresol red and titanium dioxide as the Sensing layer and tin-diffused planar glass slide as the substrate. The UV-visible spectrum before and after analyte exposure was investigated to detect the color transformation of Sensing layer and to select a laser light source wavelength (532 nm). DMA detection response along with time were performed on an optical waveguide system at room temperature. Experimental results show that this Sensing Film had not only fast response (6 s) but also rapid recovery (21 s) (${0.004}\;{{\rm mg/m}^3}$0.004mg/m3). Besides, detection is available for DMA solution as low as ${0.0008}\;{{\rm mg/m}^3}$0.0008mg/m3 concentration with signal-to-noise ratio (S/N) 5.29. The Sensing Film is stable for one month at ambient temperature, and the response reaction is reversible.
Toyosaka Moriizumi - One of the best experts on this subject based on the ideXlab platform.
-
Classification and evaluation of Sensing Films for QCM odor sensors by steady-state sensor response measurement
Sensors and Actuators B: Chemical, 2000Co-Authors: K. Nakamura, Takamichi Nakamoto, Toyosaka MoriizumiAbstract:Abstract When we discriminate gases using quartz crystal microbalances (QCMs) odor sensors, it is important to understand gas sorption characteristics of Sensing Film materials coated on their electrodes and to select them according to target gases. Although we have so far studied the properties of various kinds of Sensing Film materials by a flow-type odor Sensing system to measure transient responses, the steady-state responses are measured in the present study to evaluate partition coefficient precisely. Twenty-four Sensing Film materials were chosen from gas chromatography (GC) stationary phases and lipids, 41 sample gases from volatile organic compounds (VOCs) and odorants as sample gases. Then, we tried to classify the Sensing Films using principal component analysis (PCA). As the result of analysis, it was found that sorption characteristics of GC materials mainly depend on their polarity. The properties of lipid Films do not depend on the number of carbon atoms (C16, 18, 20) in the tails but depend on the kind of head group and the number of double bond in the tail. Moreover, we tried to classify the odorants using those 24 kinds of sensors and PCA.
-
Quartz Crystal Microbalance Odor Sensor Coated with Mixed-Thiol-Compound Sensing Film
Japanese Journal of Applied Physics, 1998Co-Authors: Atsushi Saitoh, Tooru Nomura, Severino Munoz, Toyosaka MoriizumiAbstract:The relationship between the Sensing Film material and odor sensor selectivity, as measured using quartz crystal microbalance, has been examined in previous studies. However, selectivity depends not only on the Film material, but also on the structure of the Sensing Films. In the present study, the relationship between the structure of Sensing Film and the response characteristics observed during Film is investigated. Thiol compounds with different molecular structures and atomic groups were mixed and used as Sensing Film materials. The mixing ratio was varied to produce different Film structures. In addition, we demonstrated a new self-assembly method for making a Sensing Film with the desired specific response property, using the interaction between odor molecules and Sensing Film molecules due to their affinity. The experimental results indicate that the sensor response is influenced by the Sensing Film structure, and that sensors with specific response properties can be produced by controlling the Film structure.
-
Quartz crystal microbalance odor sensor coated with mixed-thiol-compound Sensing Film
Proceedings of the 1998 IEEE International Frequency Control Symposium (Cat. No.98CH36165), 1Co-Authors: Atsushi Saitoh, Tooru Nomura, Severino Munoz, Toyosaka MoriizumiAbstract:The selectivity of the quartz crystal microbalance odor sensor is influenced by the Sensing Film structure. Thiol compounds were used for the Sensing Film materials. We made and used several mixed Sensing Films with different Film structures. The mixing ratio was varied to produce different Film structures. From a comparison of the sensor response properties and the observation of the Film structure by AFM, we verified that the different Film structures and thus different response properties can be achieved by varying the mixed ratio of the Sensing Film. This result indicates that the control of the Sensing Film structure is important for obtaining a sensor with the desired response property. We demonstrated a new method for the deposition of Sensing Film with a desired response property, using the affinity between odor molecules and Sensing Film materials in the depositing solution. By using this method, we can easily obtain a sensor with the desired response property.
-
Optimization of Sensing Film for quartz crystal microbalance odor sensor using self-assembly deposition method
Proceedings of the 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium (Cat. No.99CH363, 1Co-Authors: Atsushi Saitoh, Tooru Nomura, Severino Munoz, Toyosaka MoriizumiAbstract:We demonstrated a new self-assembly method using thiol compounds for making a Sensing Film with a desired specific response property, using the interaction between odor molecules and Sensing Film molecules due to their affinity. The Sensing Film was deposited self-assembly on a QCM with gold electrode in the mixed solution of Sensing Film materials and odor molecules. This method realizes easy fabrication of the sensor with a desired response property. In addition, we investigated response property of the sensor having a surface function group controlled Sensing Film by self-assembly method. In this experiment, amino group, hydroxyl group, and -CH/sub 3/ group were used for the function group. The results of a series of the sensor response measurement indicated the importance of the function groups on the Sensing Film surface and the necessity of controlling the surface.
Kentye Yong - One of the best experts on this subject based on the ideXlab platform.
-
size dependence of au np enhanced surface plasmon resonance based on differential phase measurement
Sensors and Actuators B-chemical, 2013Co-Authors: Wing Cheung Law, Shuwen Zeng, Yating Zhang, Xuan Quyen Dinh, Kentye YongAbstract:Abstract The impact of spherical gold nanoparticles (Au NPs) with diameters of 40–80 nm for the enhancement of surface plasmon resonance (SPR) Sensing signals is presented. Numerical analysis is given to simulate the perturbation of evanescent field in the presence of Au NPs. The results indicate that Au NPs with 40 nm possess the highest coupling effect when the separation of Au NP and SPR Sensing Film is fixed at 5 nm. For experimental demonstrations, colloidal Au NPs with different sizes but unified extinction coefficient (optical density) are immobilized onto SPR Sensing Films respectively through a spacer, dithiothreitol (DTT). Phase changes of the reflected SPR signals, which are associated with the plasmonic coupling between the NPs and Sensing Film, are monitored using a differential phase SPR sensor. Results obtained from the experiments show good agreement with the theoretical studies. This work can considerably serve as a solid guidance for future development of Au NPs-enhanced SPR sensors.
-
sensitivity improved surface plasmon resonance biosensor for cancer biomarker detection based on plasmonic enhancement
ACS Nano, 2011Co-Authors: Kentye Yong, Alexander Baev, Paras N PrasadAbstract:In this study, we report the development of a nanoparticle-enhanced biosensor by integrating both the nanoparticles and immunoassay Sensing technologies into a phase interrogation surface plasmon resonance (SPR) system for detecting antigen at a concentration as low as the femtomolar range. Our work has demonstrated that the plasmonic field extension generated from the gold Film to gold nanorod (GNR) has led to a drastic sensitivity enhancement. Antibody-functionalized Sensing Film, together with antibody-conjugated GNRs, was readily served as a plasmonic coupling partner that can be used as a powerful ultrasensitive sandwich immunoassay for cancer-related disease detection. Experimentally, it was found that the bioconjugated GNR labels enhance the tumor necrosis factor alpha (TNF-α) antigen signal with more than 40-fold increase compared to the traditional SPR bioSensing technique. The underlying principle was analyzed by simulating the near-field coupling between the Sensing Film and the GNR. The result...
Xueming Ma - One of the best experts on this subject based on the ideXlab platform.
-
ZnO Sensing Film thickness effects on the sensitivity of surface plasmon resonance sensors with angular interrogation
Materials Science and Engineering: B, 2010Co-Authors: Ming Bao, Dongmei Jiang, Wenjuan Cheng, Ge Li, Xueming MaAbstract:The effects of ZnO Sensing Film thickness on the surface plasmon resonance (SPR) curve have been investigated. ZnO Sensing Films with the thickness of 20nm, 30nm, 200nm, 220nm and 240nm have been deposited onto Ag/glass substrates by radio frequency magnetron (RF) sputtering and thermally treated at 300°C in air for 1h. The surface morphology of the sample was inspected using an atomic force microscope (AFM). The refractive index of the ZnO Films was extracted by using spectroscopic ellipsometry (SE). Theoretical analysis of the sensitivity of the SPR sensors with different ZnO Sensing Film thickness is discussed, and the experimental results are in agreement with the calculated value. Also, the theoretical calculation of the effects of ZnO Film thickness on the SPR curves in the presence of different analytes are presented and studied. It is demonstrated that SPR sensors with angular interrogation may attain higher sensitivity and can detect higher surface environment refractive index with proper ZnO Sensing Film thickness.
