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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • metal object detection (MOD)
  • wireless power transfer (WPT)
  • auxiliary detection coil
  • Chest X-ray (CXR)
  • Computer-aided Diagnosis (CADx)
  • Early detection of tuberculosis
应用领域
  • Electrical Engineering and Automation
  • Optoelectronic Information Science and Engineering
机构单位
  • Shanghai Jiao Tong University
  • Bandung Institute of Technology (ITB)
1611 条数据
?? 中文（中国） ▾

  • Plasmonic MoO2 nanospheres assembled on graphene oxide for highly sensitive SERS detection of organic pollutants

    摘要： The molybdenum oxide and graphene oxide (MoO2/GO) nanocomposite has been fabricated via simple hydrothermal assisted synthesis using Mo and MoO3 as precursors. The MoO2 nanospheres with porous hollow structure are assembled onto GO nanosheets. Profiting from the plasmonic effects of MoO2 and synergistic effect of MoO2 and GO, this hybrid nanomaterial exhibits significantly enhanced surface enhanced Raman scattering (SERS) activity for organic pollutants. The detection limit for rhodamine 6G (R6G) is 1.0 × 10?9 M, and the maximum enhancement factor (EF) reaches up to 1.05 × 107, which is the best among the semiconductor-based SERS materials. For practical application, the MoO2/GO SERS substrates are also applied to detect Methylene blue (MB) in river water, and the detection limit (1.0 × 10?8 M) can be acquired. Pyrene is also chosen as probe molecule, and quantitative determination is achieved with detection limit of 1.0 × 10?7 M. These demonstrate the well feasibility for multi-molecule detection. Furthermore, the nanocomposite displays high stability, reproducible stability, and acid and alkali resistance.

    关键词： Organic pollutants,Plasmonic effect,SERS,Graphene oxide,Detection,MoO2

    更新于2025-11-14 15:27:09

  • Peptide-Functionalized Quantum Dots for Rapid Label-Free Sensing of 2,4,6-Trinitrotoluene

    摘要： Explosive compounds, such as 2,4,6-trinitrotoluene (TNT), pose a great concern in terms of both global public security and environmental protection. There are estimated to be hundreds of TNT contaminated sites all over the world, which will affect the health of humans, wildlife, and the ecosystem. Clearly, the ability to detect TNT in soils, water supplies, and wastewater is important for environmental studies but also important for security, such as in ports and boarders. However, conventional spectroscopic detection is not practical for on-site sensing because it requires sophisticated equipment and trained personnel. We report a rapid and simple chemical sensor for TNT by using TNT binding peptides which are conjugated to fluorescent CdTe/CdS quantum dots (QDs). QDs were synthesized in the aqueous phase, and the peptide was attached directly to the surface of the QDs by using thiol groups. The fluorescent emission from the QDs was quenched in response to the addition of TNT. The response could even be observed by the naked eye. The limit of detection from fluorescence spectroscopic measurement was estimated to be approximately 375 nM. In addition to the rapid response (within a few seconds), selective detection was demonstrated. We believe this label-free chemical sensor contributes to progress for the on-site explosive sensing.

    关键词： quantum dots (QDs),explosive detection,2,4,6-trinitrotoluene (TNT),label-free sensing,peptide-functionalized

    更新于2025-11-14 15:23:50

  • Preparation of DNA functional phosphorescent quantum dots and application in melamine detection in milk

    摘要： Bio-functionalization of quantum dots (QDs) is of important value in practical applications. With single-stranded DNA (ssDNA) rich in thymine T and thioguanine G taken as the template, a new-type nanocomposite material (ssDNA-PQDs) synthesized from low-toxicity T-ssDNA functionalized Mn–ZnS and room-temperature phosphorescent (RTP) QDs (PQDs) was prepared in this paper by optimizing synthesis conditions, and these ssDNA-PQDs could emit orange RTP signals at 590 nm. As these ssDNA-PQDs are rich in T sequences and T sequences can bond with melamine through the hydrogen-bond interaction, ssDNA-PQDs experience aggregation, thus causing phosphorescent exciton energy transfer (PEET) between ssDNA-PQDs of di?erent particle sizes and their RTP quenching. Based on this principle, an RTP detection method for melamine was established. The linear range and detection limit of the detection method are 0.005–6 mM and 0.0016 mM respectively. As this method is based on the RTP nature of ssDNA-PQDs, it can avoid disturbance from background ?uorescence and scattered light of the biological ?uid, and it is very suitable for melamine detection in the biological ?uid milk.

    关键词： DNA functionalized quantum dots,milk safety,melamine detection,room-temperature phosphorescent

    更新于2025-11-14 15:23:50

  • Synthesis, crystal structure and fluorescent sensing property of metal-organic frameworks with 1,3-di(1H-imidazol-4-yl)benzene and 1,4-phenylenediacetate

    摘要： In this work, two new metal–organic frameworks (MOFs) based on 1,3-di(1H-imidazol-4-yl)benzene (L) and 1,4-phenylenediacetic acid (H2pda), namely [Ni(L)(pda)(H2O)] (1) and [Cd(L)(pda)] (2), have been achieved. MOFs 1 and 2 have distinct infinite one-dimensional (1D) chain structures, which are further linked together by hydrogen bonding interactions to give the eventual three-dimensional (3D) supramolecular architectures. Photoluminescence studies revealed that the Cd(II) MOF 2 shows strong emission at 346 nm upon excitation at 308 nm at room temperature. Furthermore, 2 can efficiently detecting acetone molecules, and Fe3+ and Cr2O7 2- ions via fluorescent quenching.

    关键词： Acetone,Ions,Metal-organic frameworks,Detection,Luminescence

    更新于2025-11-14 15:18:02

  • Thermal atomic layer deposition of AlOxNy thin films for surface passivation of nano-textured flexible silicon

    摘要： Aluminum oxynitride (AlOxNy) films with different nitrogen concentration are prepared by thermal atomic layer deposition (ALD) for flexible nano-textured silicon (NT-Si) surface passivation. The AlOxNy films are shown to exhibit a homogeneous nitrogen-doping profile and the presence of an adequate amount of hydrogen, which is investigated by Time-of-Flight Elastic Recoil Detection Analysis (ToF-ERDA). The effective minority carrier lifetimes are measured after the NT-Si surface passivation; the minimum surface recombination velocity (SRV) of 5 cm-s-1 is achieved with the AlOxNy film in comparison to the Al2O3 and AlN films (SRV of 7–9 cm-s-1). The better SRV with AlOxNy film is due to the collective effect of field-effect passivation by the presence of fixed negative charges, and chemical passivation by the presence of hydrogen within the film. The capacitance-voltage, and conductance measurements also are carried out using metal-oxide-semiconductor structure to determine the fixed negative charge density (Nf,ox), and defect density of states (Dit) in the AlOxNy films. The better surface passivation is attributed to unusually large Nf,ox of ~6.07 × 1012 cm-2, and minimal Dit of ~1.01 × 1011 cm-2-eV-1 owing to the saturation of Si dangling bonds by the hydrogen within the AlOxNy film matrix after the annealing step.

    关键词： Surface passivation,Time-of-flight elastic recoil detection analysis (ToF-ERDA),Aluminum oxynitride,Thermal atomic layer deposition,Black flexible silicon

    更新于2025-10-22 19:40:53

  • [IEEE 2018 57th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE) - Nara (2018.9.11-2018.9.14)] 2018 57th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE) - Development of a Person-Searching Algorithm Using an Omnidirectional Camera and LiDAR for the Tsukuba Challenge

    摘要： In this paper, we propose a method to detect the direction of a specific color person and a signboard using an omnidirectional camera and a 3D-LiDAR. For the person searching, we used a combination of an omnidirectional camera and a 3D-LiDAR. The omnidirectional camera was used to detect the direction of the specific color person and the signboard. The 3D-LiDAR was used to detect the distance to the person and the signboard. We conducted experiments in indoor and outdoor environments. The experimental results show that the proposed method can detect the direction of the specific color person and the signboard.

    关键词： omnidirectional camera,person searching,signboard detection,3D-LiDAR,specific color detection

    更新于2025-09-23 15:23:52

  • [IEEE 2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) - Bologna, Italy (2018.9.9-2018.9.12)] 2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) - Improved LAS Detector for MIMO Systems with Imperfect Channel State Information

    摘要： The performance of coherent symbol detection in multiple-input multiple-output (MIMO) systems is tightly related to the channel knowledge at the receiver side. For MIMO detection, achieving near-optimal performance with a low computational complexity has been a topic of several recent researches. In this paper, we propose a robust detector for uncoded MIMO systems with imperfect CSI (ICSI). The proposed detector is based on the likelihood ascent search (LAS) algorithm which achieves near maximum likelihood (ML) performance with a reduced complexity. To take into account the channel estimation error, we propose to use a modified likelihood metric function. Moreover, to enhance the system performance, we suggest to perform the channel estimation and the data detection in an iterative manner. Simulation results show that the proposed scheme outperforms the conventional LAS detector.

    关键词： LAS detector,MIMO systems,robust detection,iterative detection,imperfect CSI

    更新于2025-09-23 15:23:52

  • Focal Boundary Guided Salient Object Detection

    摘要： The performance of salient object segmentation has been significantly advanced by using deep convolutional networks. However, these networks often produce blob-like saliency maps without accurate object boundaries. This is caused by the limited spatial resolution of their feature maps after multiple pooling operations, and might hinder downstream applications that require precise object shapes. To address this issue, we propose a novel deep model—Focal Boundary Guided (Focal-BG) network. Our model is designed to jointly learn to segment salient object masks and detect salient object boundaries. Our key idea is that additional knowledge about object boundaries can help to precisely identify the shape of the object. Moreover, our model incorporates a refinement pathway to refine the mask prediction, and makes use of the focal loss to facilitate the learning of the hard boundary pixels. To evaluate our model, we conduct extensive experiments. Our Focal-BG network consistently outperforms state-of-the-art methods on five major benchmarks. We provide a detailed analysis of these results and demonstrate that our joint modeling of salient object boundary and mask helps to better capture shape details, especially in the vicinity of object boundaries.

    关键词： Salient Object Segmentation,Deep Learning,Visual Saliency Detection,Boundary Detection

    更新于2025-09-23 15:23:52

  • Fully Packaged Portable Thin Film Biosensor for the Direct Detection of Highly Pathogenic Viruses from On-Site Samples

    摘要： The thin film transistor (TFT) is a promising biosensor system with great sensitivity, label-free detection, and a quick response time. However, even though the TFT sensor has such advantageous characteristics, the disadvantages hamper the TFT sensor's application in the clinical field. The TFT is susceptible to light, noise, vibration, and limited usage, and this significantly limits its on-site potential as a practical biosensor. Herein, we developed a fully packaged, portable TFT electrochemical biosensor into a chip form, providing both portability through minimizing the laboratory equipment size and multiple safe usages by protecting the semiconductor sensor. Additionally, a safe environment that serves as a miniature probe station minimizes the previously mentioned disadvantages, while providing the means to properly link the TFT biosensor with a portable analyzer. The biosensor was taken into a biosafety level 3 (BSL-3) laboratory setting to analyze highly pathogenic avian influenza virus (HPAIV) samples. This virus quickly accumulates within a host, and therefore, early stage detection is critical to deterring the further spread of the deadly disease to other areas. However, current on-site methods have poor limits of detection (105?106 EID50/mL), and because the virus has low concentration in its early stages, it cannot be detected easily. We have compared the sample measurements from our device with virus concentration data obtained from a RT-PCR (virus range: 100?104 EID50/mL) and have identified an increasing voltage signal which corresponds to increasing virus concentration.

    关键词： avian influenza virus,label-free detection,portable biosensor,chip sensor,rapid detection

    更新于2025-09-23 15:23:52

  • Coherent detection of ultraweak electromagnetic fields

    摘要： We explore the application of heterodyne interferometry for a weak-field coherent detection scheme. The methods detailed here will be used in ALPS II, an experiment designed to search for weakly interacting, sub-eV particles. For ALPS II to reach its design sensitivity this detection system must be capable of accurately measuring fields with equivalent amplitudes on the order of 10?5 photons=s or greater. We present initial results of an equivalent dark count rate on the order of 10?5 photons=s as well as successful generation and detection of a signal with a field strength equivalent to 10?2 photons=s.

    关键词： axionlike particles,heterodyne interferometry,ALPS II,weak-field detection,coherent detection

    更新于2025-09-23 15:23:52