A Novel Oriented CNT fiber/PDMS Elastic Conductive Composite with Reversible Two-stage Conductivity

NANO ◽  
2021 ◽  
pp. 2150062
Author(s):  
Yilian Xiong ◽  
Ruiqi Ma ◽  
Min Jiang ◽  
Wenxin Lin ◽  
Hongliang Zhu ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Chemical Vapor ◽  
The Novel ◽  
Two Stage ◽  
Conductive Composite ◽  
Carbon Nanotube Fiber ◽  
Stretchable Conductors ◽  
Cnt Fiber ◽  
Conductive Properties ◽  
Catalyst Chemical Vapor Deposition

In recent years, intensive researches have been stimulated to explore the promising prospect for carbon nanotubes (CNTs) in the fabrication of novel polymer sensor composites. In this study, the fabrication and properties of a flexible and stretchable composite elastomer fabricated from direct-spun carbon nanotube fiber (yarns) were presented, and the novel CNT fiber/polydimethylsiloxane (PDMS) elastic conductive composite shows the reversible two-stage conductivity owing to its unique structure of CNTs fabricated by the floating catalyst chemical vapor deposition (FCCVD). As the strain increased from 0% to 10% (Stage I), stretching the oriented CNT fiber/PDMS elastic conductive composite induces a constant decrease in the conductive pathways and contact areas between CNTs depending on the stretching distance. However, this composite elastomer will retain almost stable electrical resistance while being stretched by over 10% (Stage II). Furthermore, the composite shows very little variation in resistance under 187 stretching–releasing cycles up to a pre-strain level of 6%, indicating the outstanding stability and repeatability in performance as stretchable conductors. The microstructure, reversible two-stage conductive properties and mechanism were also discussed.

scholarly journals CH4 and CO2 Detection by Using Carbon Nanotube-Based Sensors

2011 ◽  
Vol 214 ◽  
pp. 482-489 ◽  
Author(s):  
Amin Firouzi ◽  
Shafreeza Sobri ◽  
Faizah Mohd Yasin ◽  
Fakhru'l Razi Ahmadun
Keyword(s):  
Electrical Resistance ◽  
Gas Flow ◽  
Gas Adsorption ◽  
Quartz Substrate ◽  
Chemical Vapor ◽  
Experimental Conditions ◽  
Cvd Method ◽  
Type Semiconductor ◽  
P Type ◽  
Catalyst Chemical Vapor Deposition

This research was carried out to investigate the effect of gas adsorption towards the electrical resistance of carbon nanotubes (CNTs) thin film. CNTs were synthesized by Floating Catalyst Chemical Vapor Deposition (FC-CVD) method on quartz substrate at 950°C under methane gas flow rate of 150 Standard Cubic Centimeters per Minute (SCCM). Then, the electrical resistance of CNTs was measured by exposing the sensors to CO2 and CH4 gases operating at room temperature. The sensors showed high responses to the gaseous molecules. In the same experimental conditions, the recovery of the sensors was different for CO2 and CH4. It was also observed that the CNTs device behaves as a p-type semiconductor when exposed to gaseous molecules. The fabrication process was relatively simple and did not require special techniques.

Properties of Catalytic-Cvd Amorphous Silicon-Germanium (a-SiGe:H)

1990 ◽  
Vol 192 ◽  
Author(s):  
Hideki Matsumura ◽  
Masaaki Yamaguchi ◽  
Kazuo Morigaki
Keyword(s):  
Amorphous Silicon ◽  
Silicon Germanium ◽  
Hydrogenated Amorphous Silicon ◽  
Chemical Vapor ◽  
Characteristic Energy ◽  
Optical Band Gaps ◽  
Spin Resonance ◽  
Amorphous Silicon Germanium ◽  
Conductive Properties ◽  
Hydrogenated Amorphous

ABSTRACTHydrogenated amorphous silicon-germanium (a-SiGe:H) films are prepared by the catalytic chemical vapor deposition (Cat-CVD) method using a SiH4, GeH4 and H4 gas mixture. Properties of the films are investigated by the photo-thermal deflection spectroscopy (PDS) and electron spin resonance (ESR) measurements, in addition to the photo-conductive and structural studies. It is found that the characteristic energy of Urbach tail, ESR spin density and other photo-conductive properties of Cat-CVD a-SiGe:H films with optical band gaps around 1.45 eV are almost equivalent to those of the device quality glow discharge hydrogenated amorphous silicon (a-Si:H).

Chemical Vapor Deposition of HfO2Thin Films Using the Novel Single Precursor Hafnium 3-Methyl-3-pentoxide, Hf(mp)4

2005 ◽  
Vol 17 (26) ◽  
pp. 6713-6718 ◽  
Author(s):  
Taek S. Yang ◽  
Ki-Seok An ◽  
Eun-Joo Lee ◽  
Wontae Cho ◽  
Hong S. Jang ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
The Novel ◽  
Single Precursor

A two-stage clustering-based cold-start method for active learning

2021 ◽  
Vol 25 (5) ◽  
pp. 1169-1185
Author(s):  
Deniu He ◽  
Hong Yu ◽  
Guoyin Wang ◽  
Jie Li
Keyword(s):  
Active Learning ◽  
Class Imbalance ◽  
Imbalanced Data ◽  
Cold Start ◽  
Classification Performance ◽  
The Novel ◽  
Two Stage ◽  
Minority Class ◽  
Novel Method ◽  
Multiple Clusters

The problem of initialization of active learning is considered in this paper. Especially, this paper studies the problem in an imbalanced data scenario, which is called as class-imbalance active learning cold-start. The novel method is two-stage clustering-based active learning cold-start (ALCS). In the first stage, to separate the instances of minority class from that of majority class, a multi-center clustering is constructed based on a new inter-cluster tightness measure, thus the data is grouped into multiple clusters. Then, in the second stage, the initial training instances are selected from each cluster based on an adaptive candidate representative instances determination mechanism and a clusters-cyclic instance query mechanism. The comprehensive experiments demonstrate the effectiveness of the proposed method from the aspects of class coverage, classification performance, and impact on active learning.

Solving the dilemma in supplier selection by the group of weight vector with kernel

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sifeng Liu ◽  
Tao Liu ◽  
Wenfeng Yuan ◽  
Yingjie Yang
Keyword(s):  
Decision Model ◽  
Weight Vector ◽  
Clustering Coefficient ◽  
The Novel ◽  
Two Stage ◽  
Content Type ◽  
Grey Clustering ◽  
Coefficient Vector ◽  
Overall Evaluation ◽  
Selection Decision

PurposeThe purpose of this paper is to solve the dilemma in the process of major selection decision-making.Design/methodology/approachFirstly, the group of weight vector with kernel has been defined. Then, the weighted comprehensive clustering coefficient vector was calculated based on the group of weight vector with kernel. Under the action of weighted comprehensive clustering coefficient vector, the information including in other components around component k and supporting object i to be classified into the k-th category has been gathered to component k. At last, a novel two-stage decision model based on the group of weight vector with kernel and the weighted comprehensive clustering coefficient vector is put forward to solve the dilemma in grey clustering evaluation. Then the overall evaluation conclusion can be consistent with the clustering result according to the rule of maximum value.FindingsA new way to solve the dilemma in the process of major selection decision-making has been found. People can obtain a consistent result with two-stage decision model at the case of dilemma. That is, the conclusion of the overall evaluation is consistent with the clustering result according to the rule of maximum value.Practical implicationsSeveral functional groups of weight vector with kernel have been put forward. The proposed model can solve the clustering dilemma effectively and produce consistent results. A practical application of decision problem to solve the dilemma in supplier evaluation and selection of a key component of large commercial aircraft C919 have been completed by the novel two-stage decision model.Originality/valueThe two-stage decision model, the group of weight vector with kernel and the weighted comprehensive clustering coefficient vector were presented in this paper firstly. People can solve the dilemma in grey clustering evaluation effectively by the novel two-stage decision model based on the group of weight vector with kernel and the weighted comprehensive clustering coefficient vector.

Joining of Carbon Nanotube Fiber by the Meniscus-Confined Electrochemical Deposited Silver

NANO ◽  
2021 ◽  
pp. 2150071
Author(s):  
Qian Zhang ◽  
Yang Li ◽  
Yecheng Wang ◽  
Sunusi Marwana Manladan ◽  
Sansan Ao ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electrochemical Deposition ◽  
Electrical Resistance ◽  
High Strength ◽  
Fracture Load ◽  
Low Resistance ◽  
Carbon Nanotube Fiber ◽  
Uniform Microstructure ◽  
Wide Range ◽  
Carbon Nanotube Fibers

To use carbon nanotube fibers (CNT) extensively in a wide range of electrical and electronic applications, an essential key step is to produce a low-resistance, high-strength and reliable connection between the CNT fibers and other live parts in the circuit. In this study, meniscus-confined electrochemical deposition (ECD) process with silver was proven to be a practical way of joining CNT fibers together head-to-head. The whole ECD process was stable. The shape of the joints was found to depend on the shape of the tips of the CNT fibers. The deposited silver exhibited a dense and uniform microstructure and it was tightly bound to the CNT fibers, with a distinct interface between them. In the ECD process, the original morphology of the CNT network was maintained. The lowest electrical resistance of the CNT fibers joints was measured to be 8.72[Formula: see text][Formula: see text], which is 45% lower than that of the original CNT fibers. The deposited joint sustained a fracture load of 7.5cN with an elongation of 0.4%.

scholarly journals High throughput production of single-wall carbon nanotube fibres independent of sulfur-source

Nanoscale ◽  
2019 ◽  
Vol 11 (39) ◽  
pp. 18483-18495 ◽  
Author(s):  
Adarsh Kaniyoor ◽  
John Bulmer ◽  
Thurid Gspann ◽  
Jenifer Mizen ◽  
James Ryley ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Carbon Nanotube ◽  
High Throughput ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Sulfur Source ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Catalyst Chemical Vapor Deposition

Rapidly jetting precursors in floating catalyst chemical vapor deposition produces monodisperse, metallic single-wall carbon nanotube fibres, irrespective of sulfur source.

“Picture it all, Darley”

2015 ◽  
Vol 70 (1) ◽  
pp. 65-101 ◽  
Author(s):  
Sari Altschuler
Keyword(s):  
African Americans ◽  
Media History ◽  
The Novel ◽  
Two Stage ◽  
Race Politics ◽  
Current Events ◽  
History Of ◽  
The Media ◽  
Representational Limits ◽  
History Of Race

Sari Altschuler “‘Picture it all, Darley’: Race Politics and the Media History of George Lippard’s The Quaker City” (pp. 65–101) This essay adresses two related questions. First, how did George Lippard’s The Quaker City develop from a multimedia story told through newspaper conventions, illustration, and two plays into the novel that appeared in May 1845? And second, how did Lippard’s white-seduction narrative come to pivot around the nightmare of an ambiguously raced Devil-Bug? Joining these questions of form and content, I argue that the media history of The Quaker City is inextricable from its history of race. In the wake of the almost riot around the mid-serialization of his Philadelphia play, Lippard moved away from fictionalizing current events toward the “grotesque-sublime” through a broader critique of Philadelphia less open to charges of libel. This shift took place through the transformation of Devil-Bug, a character Lippard rapidly developed in the middle installments until he was complex enough to carry the new story. Turning the once-black Devil-Bug into his protagonist, however, required character developments that necessarily complicated the story’s representation of race, a process that occurred concurrently with events related to the work that highlighted the systemic oppression of African Americans. In winter 1844, troubles with two stage productions and his illustrator highlighted the problems of representing race. After a several-month hiatus, Lippard published new installments vituperously condemning the representational limits of these nonprose forms and turned to prose to develop his antislavery position through Devil-Bug. As a result of these confluent developments, The Quaker City became an antislavery text through the process of opening Devil-Bug’s character up to its own hybridity and interiority.

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