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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Proposal of a Precision Probe-Tilt Adjustment with the RF Signal Detection Technique
摘要： This study proposes a precision probe-tilt adjustment for an on-wafer measurement system. An original probe station with an electro-actuating goniometer stage was constructed to demonstrate the proposed technique. The tilt angle of a probe was shifted in the adjustment operation to acquire the S-parameter. The acquired S-parameter was analyzed to determine the angle of the goniometer stage, where the probe tip was aligned parallel to the substrate. The tilt angle was repeatedly estimated as ± 0.35 degree, which is over one degree in a conventional adjustment technique by direct observation with a microscope.
关键词： S-parameter,RF signal detection technique,probe tilt angle,on-wafer measurement
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Coherent Dynamics of Nanowire Force Sensors
摘要： We describe the use of grown nanowires as scanning directional force sensors. Two orthogonal flexural modes are used to demonstrate vectorial sensing of electric and magnetic fields. Furthermore, we show that the modes can be strongly coupled by demonstrating Rabi oscillations. These results open the way to implement coherent control and frequency stabilization in nanomechanical force and mass sensors.
关键词： Scanning probe microscopy,nanomechanics,quantum sensing,nanowires,frequency fluctuations
更新于2025-09-10 09:29:36
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Towards Unveiling the Exact Molecular Structure of Amorphous Red Phosphorus by Single-molecule Studies
摘要： Since the discovery of amorphous red phosphorus (a-red P) in 1847, a number of possible structures of a-red P have been proposed. However, the exact molecular structure of a-red P is not determined yet due to the amorphous nature. Here in this study, we utilize several methods to investigate some basic properties of a-red P, which are helpful to determine the structure. The experimental results from scanning tunneling microscopy (STM) and gel permeation chromatography (GPC) confirm that a-red P is a linear inorganic polymer with a broad molecular weight distribution. The theoretical single-molecule elasticities of the possible a-red P structures are obtained by quantum mechanical (QM) calculations. It is found that the experimental single-molecule elasticity of a-red P measured by single-molecule AFM matches with the theoretical result of the zig-zag ladder structure, indicating that a-red P may adopt this structure. Although this conclusion needs further validation in the future, this fundamental study represents a helpful attempt to solve the long-lasting riddle of red phosphorus. It is expected that the strategy utilized in this work can be applied to study other inorganic polymers.
关键词： scanning probe microscopy,single molecule,polymers,phosphorus
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Nano - Microscale Electrical Characterization of Copper Thru Silicon Vias in 3D Stacked Integrated Circuits
摘要： This paper describes the implementation of techniques and systems for different electrical measurements operating at nano and micro scales for the electrical characterization of copper filled Thru Silicon Vias used for 3D integrated circuits interconnects and defect detection in such vias.
关键词： nanoscale,3D integrated circuits,scanning microwave,thru silicon via,setup,atomic,electrical measurement,microscope,force,microscale,four-probe
更新于2025-09-10 09:29:36
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Determination of Refractive Indices of a Layered Medium under Pulsed Irradiation
摘要： Problems related to determination of refractive indices of layered strongly scattering biological media by means of an optical tomography are investigated. Methods of reconstruction of refractive indices of layers, which are based on the smoothness properties of the solution to the initial-boundary problem, are proposed within the framework of the nonstationary radiative-transfer model. The influence of the probe-pulse duration on the accuracy of recovery of the sought-for characteristics of the medium is investigated numerically.
关键词： probe-pulse duration,radiative-transfer model,refractive indices,layered medium,optical tomography
更新于2025-09-10 09:29:36
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Aspects of Modeling the Electron Probe Heating of a Semiconductor Target
摘要： The problem of heat distribution in semiconductor materials irradiated by finely focused electron beams with no exchange of heat between the target and environment is investigated by means of mathematical modeling. In quantitatively describing the energy loss of probe electrons, a model applicable to a wide range of solids and primary electron energies is used that describes separately the contributions from absorbed and backscattered electrons to the energy dissipated in the target. The nonmonotonic dependence of the maximum target heating temperature on the primary electron energy is explained using aspects of the proposed approach. Some results are illustrated using the example of semiconductor electronic materials.
关键词： heat distribution,mathematical modeling,semiconductor target,electron probe heating,primary electron energy
更新于2025-09-10 09:29:36
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Electrospun Three-Dimensional Nanofibrous Structure via Probe Arrays Inducing
摘要： The fast and precise direct-printing of micro three-dimensional (3D) structures is the important development trend for micro/nano fabrication technique. A novel method with probe arrays was built up to realize the controllable deposition of 3D electrospun nanofibrous structures. Firstly, several 3D nanofibrous structures were built on a single probe and 2-, 3-probes, which indicated that the probe height and probe interval played a key role on the 3D structure morphology. Then, different stereo nanofibrous structures based on multiprobe arrays were achieved accurately and the effects of processing parameters, including the probe height, probe interval, applied voltage and flow rate on the deposition behaviors of electrospun nanofiber over the probe arrays were investigated. The deposition area of 3D electrospun nanofibrous structures decreased with the increase of probe interval, applied voltage, and flow rate. Several 3D nanofibrous structures of special shapes including convex, triangle wave, inverted cone and complex curved surface were demonstrated by controlling the configuration of probe arrays and electrospinning parameters. This work provides an effective and simple way for the construction of 3D electrospun nanofibrous structures, which has great potentials in various medical and industrial applications.
关键词： three-dimensional micro structures,nanofiber,electrospinning,probe arrays,induced electrical field
更新于2025-09-10 09:29:36
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Phenanthrene-imidazole-based fluorescent sensor for selective detection of Ag+ and F? ions: real sample application and live cell imaging
摘要： 4-Methyl-2,6-bis(1H-phenanthro[9,10-d]imidazol-2-yl)phenol (probe-MPIP) conjugate has been designed as a selective fluorescent probe for silver (Ag+) ions. The probe-MPIP exhibits selectivity towards Ag+ in DMSO-H2O (1:9 v/v) in 50 mM HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) at pH 7.4. Moreover, the detection of probe-MPIP towards Ag+ ions could be realized with a “naked eye” with a color conversion from greenish yellow to orange. The linear relationship between fluorescence intensity and Ag+ ion concentration indicates that probe-MPIP can be used for quantification of Ag+ ions. The probe-MPIP can be used in a broad range of pH from 3 to 11. The limit of detection (LOD) and association constant (Ka) of MPIP-Ag+ complex have been determined and found to be 1.8 nM and 8.24 × 105 M?1, respectively, according to fluorescence titrations. Moreover, the binding ratio of probe-MPIP and Ag+ was found to be 1:1 by Job’s method. Furthermore, MPIP-Ag+ complex subsequently acted as a secondary fluorescent turn-on probe for fluoride (F?) ion recognition among the other anions. To assess the real-world efficacy of probe-MPIP and MPIP-Ag+ complex, a real water sample of silver and fluoride ions (Ag+ and F?) was evaluated. Furthermore, probe-MPIP and MPIP-Ag+ complex have been successfully applied to cell imaging studies.
关键词： Fluorescent probe,Silver and fluoride ion detection,Binding constant,In vitro cell imaging,Real sample analysis
更新于2025-09-10 09:29:36
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Exploration of Interfacial Porphine Coupling Schemes and Hybrid Systems by Bond-Resolved Scanning Probe Microscopy
摘要： The templated synthesis of porphyrin-based oligomers and heterosystems is of considerable interest for materials with tunable electronic gaps, photovoltaics, or sensing device elements. In this work, temperature-induced dehydrogenative coupling between unsubstituted free-base porphine units and their attachment to graphene nanoribbons on a well-defined Ag(111) support are scrutinized by bond-resolved scanning probe microscopy techniques. The detailed inspection of covalently fused porphine dimers obtained by in vacuo on-surface synthesis clearly reveals atomistic details of coupling motifs, whereby also putative reaction intermediates are identified. Moreover, the covalent attachment of porphines at preferred locations of atomically precise armchair-type graphene nanoribbons is demonstrated.
关键词： porphyrins,graphene nanoribbons,scanning probe microscopy,surface chemistry,C–C coupling
更新于2025-09-10 09:29:36
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A lysosome-targetable fluorescent probe for simultaneously sensing Cys/Hcy, GSH, and H2S from different signal patterns
摘要： Biothiols, a vital branch of reactive sulfur species (RSS) family, which are indispensable in human physiology. However, the exact functional roles of each biothiols involved in complicated physiological activities were still not fully clarified. A critical barrier is a lack of robust molecular tools which can simultaneously visualize different biothiols with distinct emission signals. Herein, the first lysosome-targetable fluorescent probe, Lyso-RC, which could respond to Cys/Hcy, GSH and H2S with different sets of signal patterns was developed. Lyso-RC responds to Cys/Hcy, GSH and H2S with the fluorescence signal patterns of blue-red, green-red, and red, respectively. Significantly, Lyso-RC is capable of discriminating lysosomal Cys/Hcy, GSH, and H2S in HeLa cells.
关键词： imaging,lysosome-targetable,simultaneous detection,fluorescent probe,biothiols
更新于2025-09-10 09:29:36