Electrical Contact Characteristics between Silicon Micropillars and Ag Nanoparticles with Controlled Mechanical Load

2012 ◽  
Vol 1429 ◽  
Author(s):  
VJ Logeeswaran ◽  
Mark Triplett ◽  
Daniel Lam ◽  
Emre Yengel ◽  
Heim Grewal ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
High Performance ◽  
Mechanical Load ◽  
Electrical Contact ◽  
Test Method ◽  
Transfer Printing ◽  
Glass Substrates ◽  
Current Voltage ◽  
Force Resolution ◽  
Nano Wires

ABSTRACTWe report an experimental investigation on employing Ag nanoparticles to provide electrical and mechanical contacts between transfer-printed semiconductor devices in the shape of micro/nano- wires and pillars. The Ag nanoparticles have diameters ranging between 200-800nm and are assembled on a 200nm Au film deposited on glass substrates. With a customized tool, an ensemble of silicon pillars were brought into contact with the silver (Ag) nanoparticles (AgNPs) by precisely controlling the displacement and applied force (pressure). Current-voltage measurements were done at force resolution of ~0.2N. The test method aims to illuminate the pillar-particle contact mechanism using the nanoparticles as conductive fillers for the next generation of high performance heteroepitaxial device transfer-printing applications.

Interfacing Ag Nanoparticles with 1D Semiconductor Micro/Nanostructures via Joule Heating for Transfer Printing Nanodevices at Room Ambient

2012 ◽  
Vol 1429 ◽  
Author(s):  
VJ Logeeswaran ◽  
Aaron M. Katzenmeyer ◽  
Mark Triplett ◽  
Matthew Ombaba ◽  
M. Saif Islam
Keyword(s):  
Joule Heating ◽  
Ag Nanoparticles ◽  
Ohmic Contacts ◽  
Electrical Contact ◽  
Electrical Current ◽  
Transfer Printing ◽  
Ambient Conditions ◽  
Particle Deformation ◽  
Au Film ◽  
Self Assembled

ABSTRACTWe describe an experiment to interface and characterize silver nanoparticle (AgNPs) aggregates that are self-assembled and plastically deformable on a thin gold (Au) film deposited on glass substrate. The electrical characterization is done using an electrical nanoprobe attached to a nano-manipulator inside a scanning electron microscope (SEM). Electrical current-voltage (I-V) measurements are made between the electrical nanoprobe in contact with the nanoparticle and the Au film. The Ag nanoparticles have diameters ranging between ~200-800nm and are self-assembled on a thiolated 100nm Au film. Application of a contact force via the nanoprobe even after substantial particle deformation reveals initially a small non-linear current. Upon current annealing through Joule heating, significant improvement in the electrical contact at the AgNP/substrate interface was observed. This is most likely based on bonding of the AgNPs to the Au film after passage of a high current. The need for such an annealing/sintering step will be critical in forming good ohmic contacts at ambient conditions during transfer printing of semiconductor micro/nanopillars.

scholarly journals Improved Device Distribution in High-Performance SiNx Resistive Random Access Memory via Arsenic Ion Implantation

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1401
Author(s):  
Te Jui Yen ◽  
Albert Chin ◽  
Vladimir Gritsenko
Keyword(s):  
High Performance ◽  
Conduction Mechanism ◽  
Random Access ◽  
Random Access Memory ◽  
Resistive Random Access Memory ◽  
Switching Behavior ◽  
Access Memory ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Limited Conduction

Large device variation is a fundamental challenge for resistive random access memory (RRAM) array circuit. Improved device-to-device distributions of set and reset voltages in a SiNx RRAM device is realized via arsenic ion (As+) implantation. Besides, the As+-implanted SiNx RRAM device exhibits much tighter cycle-to-cycle distribution than the nonimplanted device. The As+-implanted SiNx device further exhibits excellent performance, which shows high stability and a large 1.73 × 103 resistance window at 85 °C retention for 104 s, and a large 103 resistance window after 105 cycles of the pulsed endurance test. The current–voltage characteristics of high- and low-resistance states were both analyzed as space-charge-limited conduction mechanism. From the simulated defect distribution in the SiNx layer, a microscopic model was established, and the formation and rupture of defect-conductive paths were proposed for the resistance switching behavior. Therefore, the reason for such high device performance can be attributed to the sufficient defects created by As+ implantation that leads to low forming and operation power.

scholarly journals Calculating the optimal hematocrit under the constraint of constant cardiac power

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Michal Sitina ◽  
Heiko Stark ◽  
Stefan Schuster
Keyword(s):  
Blood Flow ◽  
High Performance ◽  
Animal Species ◽  
Normal Values ◽  
Mechanical Load ◽  
The Body ◽  
Trade Off ◽  
Cardiac Power ◽  
Optimal Value ◽  
Good Agreement

AbstractIn humans and higher animals, a trade-off between sufficiently high erythrocyte concentrations to bind oxygen and sufficiently low blood viscosity to allow rapid blood flow has been achieved during evolution. Optimal hematocrit theory has been successful in predicting hematocrit (HCT) values of about 0.3–0.5, in very good agreement with the normal values observed for humans and many animal species. However, according to those calculations, the optimal value should be independent of the mechanical load of the body. This is in contradiction to the exertional increase in HCT observed in some animals called natural blood dopers and to the illegal practice of blood boosting in high-performance sports. Here, we present a novel calculation to predict the optimal HCT value under the constraint of constant cardiac power and compare it to the optimal value obtained for constant driving pressure. We show that the optimal HCT under constant power ranges from 0.5 to 0.7, in agreement with observed values in natural blood dopers at exertion. We use this result to explain the tendency to better exertional performance at an increased HCT.

Conductive AFM: Probing Nano-scale Electrical Properties of Model Cell Membranes

2012 ◽  
Vol 1465 ◽  
Author(s):  
Paul Farrar ◽  
Del Atkinson ◽  
Andrew J. Gallant
Keyword(s):  
Lipid Bilayers ◽  
Electrical Contact ◽  
Pyrolytic Graphite ◽  
Elastic Response ◽  
Electrical Measurements ◽  
Contact Mode ◽  
Biologically Relevant ◽  
Atomic Force ◽  
Current Voltage ◽  
Model Cell

ABSTRACTBiologically relevant lipid bilayers supported on highly ordered pyrolytic graphite (HOPG) were probed both mechanically and electrically with a Conductive Atomic Force Microscope (C-AFM) capable of measuring ultra-low currents. Results show that these membranes undergo an elastic response up to 26 nN on average when compressed with an AFM tip. Measuring the films with a low contact force demonstrates that contact mode AFM can be used repeatedly to image without damaging the film. Based on current-voltage measurements made with the C-AFM, it is shown that apparently high resistances seen for the films could be the result of variable electrical contact between the tip and surface. As a result, the paper proposes that the deflection of the cantilever should always be measured in order to ensure knowledge of the location of the tip during all electrical measurements.

Shell thickness-dependent Au@Ag nanoparticles aggregates for high-performance SERS applications

Talanta ◽  
2019 ◽  
Vol 195 ◽  
pp. 506-515 ◽  
Author(s):  
Kaiqiang Wang ◽  
Da-Wen Sun ◽  
Hongbin Pu ◽  
Qingyi Wei
Keyword(s):  
Ag Nanoparticles ◽  
High Performance ◽  
Shell Thickness

Autogenous Shrinkage in Plain Cement Mixtures

2008 ◽  
Vol 400-402 ◽  
pp. 137-143 ◽  
Author(s):  
Vinod Rajayogan ◽  
Obada Kayali
Keyword(s):  
Experimental Determination ◽  
High Performance ◽  
High Performance Concrete ◽  
Autogenous Shrinkage ◽  
Basic Mechanism ◽  
Realistic Model ◽  
Test Method ◽  
Ongoing Research ◽  
Cement Mixtures

Determination of a realistic model for the estimation of autogenous shrinkage in plain cement mixtures has been an ongoing research among researchers in high performance concrete. While no standard test method exists for the determination of autogenous shrinkage, various researchers have designed different test methods for measurement of autogenous shrinkage. Current study involved the experimental determination of autogenous shrinkage using the test method developed by O.M.Jensen and co-workers, complimented with non-contact eddy current sensors. Measurements were conducted from as early as 1.5 hours from the time of casting. The samples were placed in a constant temperature chamber and the temperature of the sample was also monitored using a thermocouple. The study was carried out on plain cement mixtures at three water cement ratios of 0.25, 0.32 and 0.38. Measurements were also conducted on simple sealed prismatic samples but these measurements could only be collected after 24 hours of casting. The work is supplemented with CEMHYD3D simulations of the samples at similar water-cement ratios under sealed conditions so as to understand the development of the microstructure of the cement responsible for autogenous shrinkage. While experimental determination of internal relative humidity is quite difficult, data regarding chemical shrinkage, amount of water left and the development of the discontinuous capillary network from the simulations help to understand the determined experimental values of autogenous shrinkage. A detailed explanation on the causes of autogenous shrinkage and the basic mechanism responsible for it has been presented.

Successive surface engineering of TiO2 compact layers via dual modification of fullerene derivatives affording hysteresis-suppressed high-performance perovskite solar cells

2017 ◽  
Vol 5 (4) ◽  
pp. 1724-1733 ◽  
Author(s):  
Weiran Zhou ◽  
Jieming Zhen ◽  
Qing Liu ◽  
Zhimin Fang ◽  
Dan Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Surface Engineering ◽  
Perovskite Solar Cells ◽  
Engineering Method ◽  
Voltage Response ◽  
Efficiency Enhancement ◽  
Compact Layer ◽  
Fullerene Derivatives ◽  
Current Voltage

A new successive surface engineering method via a dual modification of TiO2 compact layer by PC61BM and C60-ETA was developed, affording dramatic efficiency enhancement with suppressed-hysteresis current–voltage response.

Ag nanoparticles-modified Fe2O3@MoS2 core-shell micro/nanocomposites for high-performance NO2 gas detection at low temperature

2020 ◽  
Vol 829 ◽  
pp. 154471 ◽  
Author(s):  
Mingli Yin ◽  
Yaoting Wang ◽  
Lingming Yu ◽  
Hongjun Wang ◽  
Yuanyuan Zhu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Ag Nanoparticles ◽  
High Performance ◽  
Gas Detection ◽  
Core Shell

In Situ Ag Nanoparticles Reinforced Pseudo‐Zn–Air Reaction Boosting Ag 2 V 4 O 11 as High‐Performance Cathode Material for Aqueous Zinc‐Ion Batteries

Small Methods ◽  
2019 ◽  
Vol 3 (12) ◽  
pp. 1900637 ◽  
Author(s):  
Qian Li ◽  
Yuyi Liu ◽  
Kaixuan Ma ◽  
Gongzheng Yang ◽  
Chengxin Wang
Keyword(s):  
Cathode Material ◽  
Ag Nanoparticles ◽  
High Performance ◽  
Zinc Ion ◽  
O 11
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