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A high sensitive SH-SAW biosensor based 36° Y-X black LiTaO3 for label-free detection of Pseudomonas Aeruginosa
摘要： A label-free and high sensitive shear horizontal surface acoustic wave (SH-SAW) biosensor for the nucleic acid detection of Pseudomonas Aeruginosa was developed in this work. An effective detection cell was fabricated by dint of acrylic material. The base frequency of the SH-SAW biosensor fabricated on 36°Y-X rotated black LiTaO3 piezoelectric substrate was 210 MHz. The self-assembled monolayer was formed on the gold surface of the sensitive area, and the increase of mass loading in the sensitive area leads to phase shift of SH-SAW. In this work, the detection limit has been improved by 3–4 times than that in our previous works, which is 1 nmol/L for the nucleic acid of the Pseudomonas Aeruginosa. And the phase shifts related to detection sensitivity are also elevated to 4 ° after the specific binding of the ss-DNA probes and the complementary sequences. In this study, the plot of phase shift against the logarithm of concentration of Pseudomonas aeruginosa nucleic acid was found to be linear over the range from 0.1 nmol/L to 1000 nmol/L with a correlation coefficient 0.98777. The detection limit as low as 0.28 nmol/L was achieved for Pseudomonas aeruginosa nucleic acid in this paper.
关键词： SH-SAW,Biosensor,Black LiTaO3,Limit of detection,Phase shift
更新于2025-09-11 14:15:04
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Experimental Investigation of Surface Acoustic Wave Acoustoelectric Effect using a Graphene Film on Lithium Niobate
摘要： Experimental results of the measured surface acoustic wave (SAW) acoustoelectric effect (AE) using single-layer thin-film graphene on 128°, Y-cut, and X-propagating lithium niobate (128-LN) are presented. The use of an AE amplifier in SAW communication devices, especially in gigahertz bands, could make fundamental advancements in radios, sensors, and other applications. Experimental results at 1350 MHz show the delay line asymmetry of 3 dB, given as the ratio of the forward versus reverse peak SAW frequency response, with an applied dc voltage on the graphene film.
关键词： surface acoustic wave (SAW),Piezoelectric effect,surface acoustic wave (SAW) filters
更新于2025-09-10 09:29:36
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Highly Sensitive Surface Acoustic Wave Magnetic Field Sensor Using Multilayered TbCo2/FeCo Thin Film
摘要： Over the last decades, the use of Surface Acoustic Waves (SAW) has emerged as a promising technology in many applications such as filters, signal processing but also sensors. We report the fabrication and the characterization of a SAW delay line magnetic field sensor using uniaxial multi-layered 14×[TbCo2(3.7nm)/FeCo(4nm)] nanostructured thin film deposited on Y36° Lithium Niobate (Figure 1a). The sensor shows an interesting dependency to a tunable bias magnetic field with different orientations relative to the easy axis. The obtained results are well explained using an equivalent piezo-magnetic model described in a previous work.
关键词： ΔE-effect,SAW sensor,multilayered thin film,magnetostriction
更新于2025-09-10 09:29:36
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A Low Power Receiver Front-End Design With Tunable Notch Filter for TX Leakage and Blocker Suppression
摘要： An active transmitter self-leakage suppressor for frequency-division duplex transceivers is presented. A wideband active notch ?lter is implemented at the mixer IF ports to suppress out the transmitter leakage. Since the active notch ?lter is operating at IF frequencies, its noise, power, and area consumption penalty for the overall transceiver is negligible, and it does not require any complicated amplitude and phase calibration circuitry that is necessary for the cancelers which operate at RF frequencies. Due to the transfer function seen by the active notch-?lter, its noise and distortion contribution is shaped and reduced further. The proposed design is implemented in a 65 nm standard CMOS process for an LTE receiver and provides minimum of 5 dB attenuation at duplex distance for E-UTRA band 20. For the same frequency band, it enhances the IIP2 and IIP3 of the receiver with a minimum of 12 and 6 dB, respectively. The active ?lter consumes only 1.1 mA/channel from a 2.5 V supply and occupies 0.078 mm2/channel. Its noise contribution is within the NF measurement error, thus negligible. The design is intended and tested for transmitter self-interference and wideband ACS blockers.
关键词： wideband notch ?lter,FDD transceivers,low duplex distances,wide signal bandwidth,SAW-less,voltage commutating mixers,LTE receivers,active self-leakage canceler,transmitter self-leakage
更新于2025-09-09 09:28:46
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Novel Approach for Modeling an Ionic Imprinted Polymer Based SAW Sensor with COMSOL Multiphysics
摘要： Modeling a Surface Acoustic Wave (SAW) sensor response as a chemosensor and not only as just an electronic transducer was performed with COMSOL Multiphysics. For this study, the SAW’s sensing area was functionalized with an ionic imprinted polymer (IIP), designed for the selective detection of lead ions. The idea consists in subdividing the IIP into elementary blocks whose physical properties can be modified separately. Three configurations have been envisaged: the IIP before and after lead ions extraction and the non-imprinted polymer (NIP). The generation of shear-horizontal waves on LiTaO3 piezoelectric substrate is confirmed by recording the displacement amplitude versus time, according to the three space directions. The sensors sensitivity is estimated from the delays induced by the incorporation of the lead ions in the IIP layer. To the best of our knowledge, this approach has never been presented in the literature.
关键词： SAW sensor,chemosensor,IIP after extraction,lead ions,ionic imprinted polymer (IIP),IIP before extraction,Non-imprinted polymer
更新于2025-09-09 09:28:46
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[IEEE 2018 2nd International Conference on Trends in Electronics and Informatics (ICOEI) - Tirunelveli, India (2018.5.11-2018.5.12)] 2018 2nd International Conference on Trends in Electronics and Informatics (ICOEI) - Electrode Optimization for Enhancement of Q-Factor in SAW Resonators
摘要： Surface acoustic wave (SAW) devices have wide variety of applications in communication and sensing. These resonators use a piezoelectric material to generate the acoustic waves by injecting electrical energy using Interdigitated Transducers (IDTs). The piezoelectric material transforms it into propagating mechanical waves. They work in the frequency range of MHz to several GHz. In SAW resonators, higher the Q factor lower the rate of energy loss which leads to enhanced selectivity in filters and improved sensitivity in sensors. In this paper, to enhance the Q-factor of the SAW resonator various electrode materials are analysed and optimum SAW design is obtained using COMSOL Multiphysics.
关键词： Quality factor,SAW Resonator,electrode material
更新于2025-09-09 09:28:46