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All Printed Low-Power Metal Oxide Gas Sensors on Polymeric Substrates
摘要： This paper presents a novel approach for fabrication of miniaturized and fully printed metal oxide (MOX) gas sensors on polyimide substrate by using digital manufacturing of the functional layers, namely aerosol jet and inkjet printing technologies. We are reporting for the first time a stacking approach for all-printed metal-oxide sensors. High resolution (~20 μm) printing of metallic patterns is enabled by aerosol jet of gold (Au) nanoparticles in solution, which leads to printed resistive thermal transducers with a reduced size of 500×500 μm2. Wide area printing feature of the aerosol jet is also applied for printing thin (~2 μm) inter-dielectric polyimide layer in between the heater and gold electrodes. The gas sensing layer, i.e. Pd-doped Tin Oxide (SnO2) nanoparticles, is deposited through drop on demand inkjet printing. Proper operation of the printed sensors is evaluated in both dry and humid conditions under reducing and oxidizing gases i.e. CO and NO2, respectively. All the tests are performed at 250 oC, produced by the integrated micro-hotplate at a low power consumption of ~78mW. The chemo-resistive responses of the sensors towards both the gases are found to be in the acceptable range as compared to conventional metal-oxide gas sensor responses. These results are very promising for future integration of metal-oxide gas sensors notably in smart printed electronics, disposable systems and wearables.
关键词： Aerosol Jet,Metal Oxide,Printing,Gas Sensors,Micro-hotplates,Inkjet
更新于2025-09-04 15:30:14
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[IEEE 2018 4th International Conference on Science and Technology (ICST) - Yogyakarta (2018.8.7-2018.8.8)] 2018 4th International Conference on Science and Technology (ICST) - Multi-Sensors Remote Sensing for Mapping and Monitoring Canals on Tropical Peatland
摘要： An assessment of multi-sensor remote sensing images for observation of canals on peatland in Indonesia has been carried out. Canals construction on peatlands is closely related to forest degradation and deforestation, and hence mapping and monitoring of these canals is essential for in conservation and restoration of degraded peatland Indonesia. Over million hectares of tropical peatland across the country and rapid land dynamic change, this task requires advance tools with capabilities to cover large area and detect change in near real time. With limitation possessed by each of remote sensing image, an effective and efficient mapping and monitoring system should be established by integration of these multi-sensors remote sensing. This paper presents evaluation of these images and how their performance fit into the system.
关键词： mapping and monitoring canals,images comparison,multi-sensors remote sensing,peatland degradation,tropical peatland
更新于2025-09-04 15:30:14
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Simultaneous measurements of temperature and pressure with a dual-cavity Fabry-Perot sensor
摘要： A fiber-optic dual-cavity Fabry-Perot interferometric sensor for the simultaneous measurement of temperature and pressure is proposed and experimentally demonstrated. The sensor cascades a fiber-optic intrinsic Fabry–Perot interferometer (IFPI) and an extrinsic Fabry–Perot interferometer (EFPI). The IFPI is used as the temperature sensor and the EFPI is used as the pressure sensor. The pressure sensor is based on a diaphragm-free structure, and can work stably at high temperature. Two optical path differences are interrogated simultaneously by using the fast Fourier transform-based white-light interferometry and the peak-to-peak method. Experimental results show that the proposed sensor exhibits a temperature sensitivity of 29.63 nm/°C within the temperature range of 40-1100 °C, and a pressure sensitivity of 1465.8 nm/MPa within the pressure range of 0-10 MPa at the room temperature.
关键词： pressure measurement,femtosecond laser micromachining,fiber optics sensors,Fabry-Perot interferometers,temperature measurement
更新于2025-09-04 15:30:14
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Layered Topological Insulators and Semimetals for?Magnetoresistance Type Sensors
摘要： Magnetoresistance (MR) type sensors are transducers that can vary their resistances sensitively in response to an applied magnetic field. Recently, topological quantum materials have drawn the increased attention for sensor applications due to their novel MR effects. Here, a range of MR effects occurring in the layered 3D topological insulators and topological semimetals are briefly reviewed. The MR effects include the extremely large nonsaturating MR, the giant anisotropic MR, and the unique spin-valve-like MR. The large MR ratios, the high MR anisotropy, and the low 1/f noise allow sensors to have the high sensitivity over a wide range of temperatures and magnetic fields. It is anticipated that the layered topological quantum materials with their excellent MR performance and structural flexibility would provide an ideal platform for new-generation magnetic sensor applications.
关键词： anisotropic magnetoresistance,magnetic sensors,topological quantum materials,linear magnetoresistance,tunneling magnetoresistance
更新于2025-09-04 15:30:14
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Inkjet-Printed High- <i>Q</i> Nanocrystalline Diamond Resonators
摘要： Diamond is a highly desirable material for state-of-the-art micro-electromechanical (MEMS) devices, radio-frequency filters and mass sensors, due to its extreme properties and robustness. However, the fabrication/integration of diamond structures into Si-based components remain costly and complex. In this work, a lithography-free, low-cost method is introduced to fabricate diamond-based micro-resonators: a modified home/office desktop inkjet printer is used to locally deposit nanodiamond ink as ?50–60 μm spots, which are grown into ≈1 μm thick nanocrystalline diamond film disks by chemical vapor deposition, and suspended by reactive ion etching. The frequency response of the fabricated structures is analyzed by laser interferometry, showing resonance frequencies in the range of ≈9–30 MHz, with Q-factors exceeding 104, and (f0 × Q) figure of merit up to ≈2.5 × 1011 Hz in vacuum. Analysis in controlled atmospheres shows a clear dependence of the Q-factors on gas pressure up until 1 atm, with Q ∝ 1/P. When applied as mass sensors, the inkjet-printed diamond resonators yield mass responsivities up to 981 Hz fg?1 after Au deposition, and ultrahigh mass resolution up to 278 ± 48 zg, thus outperforming many similar devices produced by traditional top-down, lithography-based techniques. In summary, this work demonstrates the fabrication of functional high-performance diamond-based micro-sensors by direct inkjet printing.
关键词： selective seeding,mass sensors,diamonds,micro-resonators,inkjet printing
更新于2025-09-04 15:30:14
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Static and Dynamic Piezopotential Modulation in Piezo-Electret Gated MoS <sub/>2</sub> Field-Effect Transistor
摘要： The piezotronic effect links the mechanical stimuli with various semiconductor devices, promising for low-power-consuming electronic devices, sensitive sensors and interactive control system. The persistent requirement for external strains in piezotronic modulation may hinder its application in some circumstances (such as devices on rigid substrate, or complicated synergistic piezoelectric modulation on multi-device). Here, we propose an efficient method to realize piezoelectric modulation of optical and electrical properties of MoS2 FET in both static and dynamic manner, expanding the application of piezotronics. Through capacitive coupling between piezo-electret and MoS2 FET, the remanent piezo-potential can efficiently tune the Fermi level of MoS2, programming the initial electrical property for subsequent fabrication of sophisticated devices. The external strain can induce enhanced piezo-potentials to further affect the energy band bending of MoS2 channel, giving rise to high performance strain sensors (large gauge factor ~4800, fast response time ~0.15s and good durability >1000 s). The proposed static and dynamic piezopotential tuned MoS2 FET is easy to extend to devices based on other materials, which is highly desired in tunable sensory systems, active flexible electronics, and human-machine interface.
关键词： piezo-electret,optical and electric properties,mechanical sensors,MoS2 FET,piezopotential modulation
更新于2025-09-04 15:30:14
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AIP Conference Proceedings [Author(s) 4TH ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2018 (EGM 2018) - Bandung, Indonesia (27–28 July 2018)] - Monitoring of public utility jeepney drivers’ aggressive driving through vehicle-to-vehicle distance using proximity sensors
摘要： This paper presents an aggressive driving monitoring system to be applied on Public Utility Jeepneys. The system has three main components: a Graphical User Interface (GUI), Main circuitry, and the Sensors. The GUI shows how many monitored aggressive driving act the driver committed during the day of his operation. The main circuitry is where all the circuitry including the power supply is located. The sensors are the detecting device that will satisfy the conditions an aggressive driving act has been committed. In this paper, the optimization of the placement of sensors at corners was very crucial since in order to do improper lane change (cutting), a curved motion should be followed. It was determined that a sequential pattern was needed for the sensors at the corner of the jeepney to detect violations accurately. The sensors for tailgating and siding will function based on the standards derived from Department of Public Works and Highways Department Order No. 11 (DPWH-DO-11) and Land Transportation Office Administrative Order 2009-018 (LTO AO 2009-018). The values acquired from the system were statistically equal to the intended violations done by the group after checking it with goodness – of – fit test. Finally, the system proved to have a reliability of 100%. This implies that the system can detect the violation done by the jeepney driver correctly at all times.
关键词： aggressive driving,monitoring system,vehicle-to-vehicle distance,proximity sensors,Public Utility Jeepneys
更新于2025-09-04 15:30:14
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[ASME ASME 2018 Dynamic Systems and Control Conference - Atlanta, Georgia, USA (Sunday 30 September 2018)] Volume 3: Modeling and Validation; Multi-Agent and Networked Systems; Path Planning and Motion Control; Tracking Control Systems; Unmanned Aerial Vehicles (UAVs) and Application; Unmanned Ground and Aerial Vehicles; Vibration in Mechanical Systems; Vibrations and Control of Systems; Vibrations: Modeling, Analysis, and Control - Negative Obstacle Detection Using LiDAR Sensors for a Robotic Wheelchair
摘要： The objective of this work is to develop a negative obstacle detection algorithm for a robotic wheelchair. Negative obstacles – depressions in the surrounding terrain including descending stairwells, and curb drop-offs – present highly dangerous navigation scenarios because they exhibit wide characteristic variability, are perceptible only at close distances, and are difficult to detect at normal operating speeds. Negative obstacle detection on robotic wheelchairs could greatly increase the safety of the devices. The approach presented in this paper uses measurements from a single-scan laser range-finder and a microprocessor to detect negative obstacles. A real-time algorithm was developed that monitors time-varying changes in the measured distances and functions through the assumption that sharp increases in this monitored value represented a detected negative obstacle. It was found that LiDAR sensors with slight beam divergence and significant error produced impressive obstacle detection accuracy, detecting controlled examples of negative obstacles with 88% accuracy for 6 cm obstacles and above on a robotic development platform and 90% accuracy for 7.5 cm obstacles and above on a robotic wheelchair. The implementation of this algorithm could prevent life-changing injuries to robotic wheelchair users caused by negative obstacles.
关键词： robotic wheelchair,negative obstacle detection,LiDAR sensors,algorithm,safety system
更新于2025-09-04 15:30:14
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Influence of Water Molecules on the Detection of Volatile Organic Compounds (VOC) Cancer Biomarkers by Nanocomposite Quantum Resistive Vapor Sensors vQRS
摘要： The anticipated diagnosis of various fatal diseases from the analysis of volatile organic compounds (VOC) biomarkers of the volatolome is the object of very dynamic research. Nanocomposite-based quantum resistive vapor sensors (vQRS) exhibit strong advantages in the detection of biomarkers, as they can operate at room temperature with low consumption and sub ppm (part per million) sensitivity. However, to meet this application they need to detect some ppm or less amounts of biomarkers in patients' breath, skin, or urine in complex blends of numerous VOC, most of the time hindered by a huge amount of water molecules. Therefore, it is crucial to analyze the effects of moisture on the chemo-resistive sensing behavior of carbon nanotubes based vQRS. We show that in the presence of water molecules, the sensors cannot detect the right amount of VOC molecules present in their environment. These perturbations of the detection mechanism are found to depend on the chemical interactions between water and other VOC molecules, but also on their competitive absorption on sensors receptive sites, located at the nanojunctions of the conductive architecture. This complex phenomenon studied with down to 12.5 ppm of acetone, ethanol, butanone, toluene, and cyclohexane mixed with 100 ppm of water was worth to investigate in the prospect of future developments of devices analysing real breath samples in which water can reach a concentration of 6%.
关键词： conductive polymer nanocomposites,anticipated diagnosis,effects of humidity,VOC,quantum resistive vapor sensors,functionalized carbon nanotubes,biomarkers detection
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Nara, Japan (2018.10.9-2018.10.12)] 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Operation Method for Display Screen Using Acceleration Sensors on a Fingertip
摘要： This paper describes a new method of operating display screens. The authors propose a method of operating the display screen by detecting the movement of acceleration sensors attached to a fingertip. In experiments, the acceleration of linear movement and rotary movement in three axial directions was detected, and the screen was operated following these movements. As a result, we verified that this proposal is valid.
关键词： Operating method,acceleration sensors,Finger tips,Display screens
更新于2025-09-04 15:30:14