Osman SahinOguz M. AlbayrakAyse Seray GuzelYaser Vaheb...
16541-16550页
查看更多>>摘要：The nucleic acid-based biosensor technologies are useful to precisely detect genetic footprints at low concentrations with high specificity and selectivity. They commonly rely on incorporating nucleic acid probes onto optical, electrochemical, or electrical transducers. Among various sensing modalities, approaches based on direct electrical measurements offer advantages in label-free detection, portability for point-of-care analysis, and direct integration with electronic readout circuits facilitating data processing, transfer, and remote interpretation. In this work, we demonstrate a novel fabrication approach, which couples conventional optical lithography and oxygen plasma-based etching with high-resolution electron-beam lithography to rapidly pattern poly(methyl methacrylate) (PMMA) e-beam resist at varying feature sizes (i.e., both large and small device areas), which would otherwise require extremely long exposure durations up to days with stand-alone e-beam lithography. This allows the fabrication of realistic biosensor chips in arrayed format, co-integrating millimeter (mm)-scale electrical peripherals and nanoscale (nm) sensing elements utilizing a simple and high-throughput process. The feasibility of the approach is demonstrated by successful immobilization of thiol-functionalized peptide nucleic acid (PNA) probes on ~60-nm-wide gold nanowires (AuNWs) integrated with a polydimethylsiloxane (PDMS) microchannel. The fabrication of biochips, integration with microfluidics, and self-assembly of PNA probes are characterized by optical microscope imaging, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS).
查看更多>>摘要：In recent years, radiation temperature measurement technology has garnered significant attention for measuring the temperature of turbine blades in aero-engines, owing to its wide measurement range, high precision, and long operational lifespan. However, operating within high-temperature and high-pressure environments, aero-engines face challenges leading to temperature measurement errors, including the reflected radiation from hot-end components, inaccuracies in measuring target surface emissivity, the absorption and emission of radiation by combustion gases, and contamination of optical lenses. During radiation temperature measurement, the accuracy of temperature measurements for turbine blades is significantly compromised. Therefore, it is crucial to investigate and correct these errors encountered to improve the accuracy of turbine blade temperature measurement. This article reviews research on the errors encountered in radiation temperature measurements of turbine blades, detailing their sources and corrective measures. Additionally, it provides a prospective outlook on the future direction of technological advancements in this field.
查看更多>>摘要：Thermal emitters applied in nondispersive infrared (NDIR) gas sensors can provide high-quality infrared emission, ensuring accurate gas detection. This review summarizes the development of thermal emitters based on the micro-electro-mechanical systems (MEMSs) technology, highlighting the optimization methods from three perspectives: structural design, microheater design, and radiation layer design. These strategies aim to achieve low power consumption, fast response, large modulation depth, and high homogeneity of thermal emitters. The review also discusses radiation materials with broadband or narrowband high emissivity, outlining their respective advantages and disadvantages. The performance of different MEMS thermal emitters is analyzed to identify optimal approaches for structural and material designs.
查看更多>>摘要：This review summarizes noise related works on piezoelectric microelectromechanical system (MEMS). First, fundamentals of piezoelectricity and noise sources are covered. Then, around 100 papers are tabulated based on the types of MEMS, authors, year of publication, piezoelectric materials, and nature of noise works i.e., theoretical, simulation, and measurement. Based on that table, we also discuss noise models, current trends, and future directions on this topic. This review is beneficial for researchers who develop next-generation piezoelectric MEMS. In the future, the influence of noise must be seriously taken into design considerations as the dimension of MEMS becomes smaller, but the complexities are higher.
查看更多>>摘要：The increasing global prevalence of cardiovascular diseases (CVDs) stresses the urgent need for cost effective, portable, and reliable biosensors to monitor cardiac health and detect disease biomarkers in real time. Recent advancements in the biosensor technology have harnessed flexible nanomaterials, chemical molecules, and integrated electronic circuits, enabling the development of compact and efficient medical devices. These innovations are driving the transition of biosensing techniques from laboratory settings to practical, real-world applications, including wearable and point-of-care (POC) devices. The seamless integration of biosensors with the human body allows for continuous, real-time cardiac monitoring, utilizing both invasive and noninvasive measurement techniques to detect critical cardiac biomarkers. Such devices enable early detection of CVDs and facilitate timely intervention, significantly improving patient outcomes. This review provides a comprehensive analysis of state-of-the-art biosensing methods for multimodal cardiac monitoring and diagnostics, highlighting recent progress in sensor development and integration with digital processors for cardiac biomarker screening. The hardware and software architectures involved in designing biosensors are also examined, with a focus on their application in tracking cardiac blood biomarkers and heartbeat signals. By evaluating current advancements, this review offers valuable insights for innovation in next-generation medical devices for early detection and continuous monitoring of cardiovascular conditions.
查看更多>>摘要：This article introduces a new micro-electromechanical systems (MEMS)-based hydrogen sulfide (H2S) gas sensor. Using a combination of sol-gel and high-temperature solid-state approaches, a sheet-structured Ni-WO3/TiO2 composite was developed. Its features, inclu- ding crystallography, elemental makeup, and surface morphology, were investigated with tools such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and SEM. XRD and XPS analyses indicate successful synthesis of Ni-WO3/TiO2 material, and SEM results reveal that the surface of the sensitive material has dense pores and is uniformly coated on the MEMS device. This material is applied to a MEMS microhotplate, showing high sensitivity and selectivity. The tests demonstrated that the sensor achieves a sensitivity rate of 0.00872 mA/ppm, characterized by strong linearity (0.91301) and swift operation, with response and recovery durations of 7 and 8 s, respectively. This gas sensor possesses high sensitivity, strong selectivity, good linear response, excellent stability, and repeatability, with a broad application potential, supporting the development of future low-cost, efficient H2S monitoring technologies.
NETL
NSTL
IEEE