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Flexible sensor

Andrew T Kleinschmidt, Darren J Lipomi
The field of π-conjugated (semiconducting) polymers has been underwritten largely because of the promise of flexible (and increasingly, stretchable) devices for energy and health care. Our research group has spent much of the past six years studying the mechanical properties of conjugated polymers. Mechanically robust materials can extend the life spans of devices such as solar cells and organic light-emitting diode (OLED) panels and enable high throughput processing techniques such as roll-to-roll printing...
December 5, 2018: Accounts of Chemical Research
Paulo Ronaldo Sousa Teixeira, Ana Siqueira do Nascimento Marreiro Teixeira, Emanuel Airton de Oliveira Farias, Edson Cavalcanti da Silva Filho, Helder Nunes da Cunha, José Ribeiro Dos Santos Júnior, Lívio César Cunha Nunes, Handerson Rodrigues Silva Lima, Carla Eiras
There are increasing concerns regarding the risks arising from the contamination of manipulators of antineoplastic drugs promoted by occupational exposure or even in the dosage of drugs. The present work proposes the use of an electrochemical sensor based on a biopolymer extracted from the babassu coconut (Orbignya phalerata) for the determination of an antineoplastic 5-fluorouracil (5-FU) drug as an alternative for the monitoring of these drugs. In order to reduce the cost of this sensor, a flexible gold electrode (FEAu) is proposed...
December 5, 2018: Analytical and Bioanalytical Chemistry
Hao-Yang Mi, Xin Jing, Zhiyong Cai, Yuejun Liu, Lih-Sheng Turng, Shaoqin Gong
Boosting power generation performance while employing economical and biocompatible materials is an ongoing direction in the field of triboelectric nanogenerators (TENGs). Here, highly porous, biocompatible, cellulose nanofibril (CNF) composite-based TENGs are developed through an environmentally friendly freeze-drying approach. High tribopositivity materials, including silica fiber, human hair, and rabbit fur, are used as fillers in composite TENG fabrication for the first time to enhance the triboelectric output performance...
December 5, 2018: Nanoscale
Mohammad Tariqul Islam, Touhidul Alam, Iskandar Yahya, Mengu Cho
In this paper, an inkjet-printed flexible Radio-Frequency Identification (RFID) tag antenna is proposed for an ultra-high frequency (UHF) sensor application. The proposed tag antenna facilitates a system-level solution for low-cost and faster mass production of RFID passive tag antenna. The tag antenna consists of a modified meander line radiator with a semi-circular shaped feed network. The structure is printed on photo paper using silver nanoparticle conductive ink. The generic design outline, as well as tag antenna performances for several practical application aspects are investigated...
November 30, 2018: Sensors
Bo Xie, Peng Mao, Minrui Chen, Zhaoguo Li, Juanjuan Han, Lun Yang, Xiuzhang Wang, Min Han, Jun-Ming Liu, Guanghou Wang
Alongside the rise in fully automated equipment and the wearable devices, there is currently a high demand for optically transparent and flexible gas sensors operating at room temperature. Nanoparticle films are ideal H2 -sensing materials that can be coupled with flexible substrates because of their discrete nanogranular structure and unique interparticle electrical responsiveness. In this work, we present an optically transparent and flexible H2 sensor based on a Pd nanoparticle film, prepared on a polyethylene terephthalate sheet using a straightforward nanocluster deposition technique...
December 4, 2018: ACS Applied Materials & Interfaces
Radu A Sporea, Luke J Wheeler, Vlad Stolojan, S Ravi P Silva
The predicted 50 billion devices connected to the Internet of Things by 2020 has renewed interest in polysilicon technology for high performance new sensing and control circuits, in addition to traditional display usage. Yet, the polycrystalline nature of the material presents significant challenges when used in transistors with strongly scaled channel lengths due to non-uniformity in device performance. For these new applications to materialize as viable products, uniform electrical characteristics on large areas will be essential...
December 3, 2018: Scientific Reports
Zifeng Wang, Funian Mo, Longtao Ma, Qi Yang, Guojin Liang, Zhuoxin Liu, Hongfei Li, Na Li, Haiyan Zhang, Chunyi Zhi
The fast advancement in flexible and wearable electronics has put up with new requirements on the energy storage device with improved tolerance to deformation apart from offering power output. Despite the tremendous progress in stretchable energy storage devices, the compressional energy storage devices have indeed received limited research attention. In this work, an intrinsically compressible rechargeable battery was proposed using the Zn-MnO2 chemistry and a crosslinked polyacrylamide (PAAm) hydrogel electrolyte...
December 3, 2018: ACS Applied Materials & Interfaces
Lei Deng, Zhe Zou, Xin Ma, Ling Liang, Guanrui Wang, Xing Hu, Liu Liu, Jing Pei, Guoqi Li, Yuan Xie
Fast object tracking on embedded devices is of great importance for applications such as autonomous driving, unmanned aerial vehicle, and intelligent monitoring. Whereas, most of previous general solutions failed to reach this goal due to the facts that (i) high computational complexity and heterogeneous operation steps in the tracking models and (ii) parallelism-limited and bloated hardware platforms (e.g., CPU/GPU). Although previously proposed devices leverage neural dynamics and near-data processing for efficient tracking, their flexibility is limited due to the tight integration with vision sensor and the effectiveness on various video datasets is yet to be fully demonstrated...
2018: Frontiers in Neuroscience
Junjun Chen, Yaoyao Hao, Shaomin Zhang, Guanghao Sun, Kedi Xu, Weidong Chen, Xiaoxiang Zheng
BACKGROUND: The neural principles underlying reaching and grasping movements have been studied extensively in primates for decades. However, few experimental apparatuses have been developed to enable a flexible combination of reaching and grasping in one task in three-dimensional (3D) space. NEW METHOD: By combining a custom turning table with a 3D translational device, we have developed a highly flexible apparatus that enables the subject to reach multiple positions in 3D space, and grasp differently shaped objects with multiple grip types in each position...
November 28, 2018: Journal of Neuroscience Methods
Carolyn E Carr, Luis A Marky
Kissing loop interactions (KLIs) are a common motif that is critical in retroviral dimerization, viroid replication, mRNA, and riboswitches. In addition, KLIs are currently used in a variety of biotechnology applications, such as in aptamer sensors, RNA scaffolds and to stabilize vaccines for therapeutics. Here we describe the thermodynamics of a basic intramolecular DNA capable of engaging in a KLI, consisting of two hairpins connected by a flexible linker. Each hairpin loop has a five-nucleotide complementary sequence theoretically capable of engaging in a KLI...
November 28, 2018: Biochimie
Lingyu Zhao, Liangpei Zhang, Jun Zhao, Jidong Shi, Zhaohe Dai, Guorui Wang, Cheng Zhang, Bo Li, Xiqiao Feng, Hui Zhang, Jin Zhang, Zhong Zhang
Deterministic design of surface patterns has seen a surge of interests due to their wide applications in flexible and stretchable electronics, microfluidics, and optical devices. Recently, instability of bi-layer systems has been extensively utilized by which micro/nano-patterns of a film can be easily achieved through macroscopically deforming the underlying substrate. For bi-layer system with traditional thermostable substrates, the pattern morphology is only determined by initial strain mismatch of the two layers, and the realization of localized patterns appears to be particularly challenging because of the difficulties associated with manipulating inhomogeneous deformations...
November 30, 2018: ACS Applied Materials & Interfaces
Joon-Hyun Kwon, Won-Young Kwak, Beong Ki Cho
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
November 29, 2018: Scientific Reports
Doo-Young Youn, Uihyun Jung, Muhammad Naqi, Seon-Jin Choi, Min-Goo Lee, Sungho Lee, Hi-Joon Park, Il-Doo Kim, Sunkook Kim
Real-time temperature monitoring of individual blood packages capable of wireless data transmission to ensure the safety of blood samples and minimize wastes has become a critical issue in recent years. In this work, we propose flexible temperature sensors using Ag nanowires (NWs) and a flexible colorless polyimide (CPI) film integrated with a wireless data transmission circuit. The unique design of the temperature sensors was achieved by patterning Ag NWs using a three-dimensional (3D) printed mold and embedding the patterned Ag NWs in the CPI film (p-Ag NWs/CPI film), which resulted in a flexible temperature sensor with electrical, mechanical, and temperature stability for applications in blood temperature monitoring...
November 29, 2018: ACS Applied Materials & Interfaces
Qinghua Zhang, Qinghua Lu, Xianmin Zhang, Junjun Wu
Residual vibration suppression of a 3-DOF flexible parallel robot mechanism is implemented in this paper. Considering the direct and inverse piezoelectric effect of PZT (lead zirconium titanate) material, a general motion equation is established which includes an input equation of PZT actuators and an output equation of PZT sensors. A strain and strain rate feedback (SSRF) controller is designed based on the established general motion equation. A numerical simulation is implemented to verify the effectiveness of the SSRF controller in driving the proposed robotic mechanism...
November 26, 2018: Sensors
Lander Urgoiti, David Barrenetxea, Jose Antonio Sánchez, Iñigo Pombo, Jorge Álvarez
Workpiece rejection originated by thermal damage is of great concern in high added-value industries, such as automotive or aerospace. Surface temperature control is vital to avoid this kind of damage. Difficulties in empirical measurement of surface temperatures in-process imply the measurement in points other than the ground surface. Indirect estimation of temperatures demands the use of thermal models. Among the numerous temperature measuring techniques, infra-red measurement devices excel for their speed and accurate measurements...
November 26, 2018: Sensors
Wenqiang Wu, Xiandi Wang, Xun Han, Zheng Yang, Guoyun Gao, Yufei Zhang, Jufang Hu, Yongwen Tan, Anlian Pan, Caofeng Pan
The quest for novel deformable image sensors with outstanding optoelectronic properties and large-scale integration becomes a great impetus to exploit more advanced flexible photodetector (PD) arrays. Here, 10 × 10 flexible PD arrays with a resolution of 63.5 dpi are demonstrated based on as-prepared perovskite arrays for photosensing and imaging. Large-scale growth controllable CH3 NH3 PbI3- x Clx arrays are synthesized on a poly(ethylene terephthalate) substrate by using a two-step sequential deposition method with the developed Al2 O3 -assisted hydrophilic-hydrophobic surface treatment process...
November 28, 2018: Advanced Materials
Wouter Marchal, Alessandro Longo, Valérie Briois, Kristof Van Hecke, Ken Elen, Marlies K Van Bael, An Hardy
Fast and scalable low-temperature deposition of microscale metallic features is of utmost importance for the development of future flexible smart applications including sensors, wireless communication, and wearables. Recently, a new class of metal-organic decomposition (MOD) copper inks was developed, consisting of self-reducing copper formate containing amine complexes. From these novel inks, copper metal features with outstanding electrical conductivity (±105 S cm-1 ) are deposited at a temperature of 150 °C or less, which is well below the reduction temperature of orthorhombic α-copper formate (around 225 °C)...
November 28, 2018: Inorganic Chemistry
Lili Wang, Shuai Chen, Wei Li, Kang Wang, Zheng Lou, Guozhen Shen
The development of materials with high efficiency and stable signal output in a bent state is important for flexible electronics. Grain boundaries provide lasting inspiration and a promising avenue for designing advanced functionalities using nanomaterials. Combining bulk defects in polycrystalline materials is shown to result in rich new electronic structures, catalytic activities, and mechanical properties for many applications. However, direct evidence that grain boundaries can create new physicochemical properties in flexible electronics is lacking...
November 28, 2018: Advanced Materials
Chengxin Hu, YuLin Zhang, Xiangdong Wang, Lu Xing, Lingying Shi, Rong Ran
Conductive hydrogels have important potential in biosensors, bioactuators and health recording electrodes, but they are often troubled by sensitivity, operating temperature range and whether they can be recycled or not. In this paper, conductive hydrogels polyvinyl alcohol/glycerol/polyaniline (PGA) were prepared by organic combination of low-cost polyvinyl alcohol (PVA), polyaniline (PANi)and glycerin. First, the effects of PVA, glycerol, aniline/phytic acid solution concentration on the mechanical properties, electrical properties and frost resistance of the PGA gel were discussed...
November 28, 2018: ACS Applied Materials & Interfaces
Stanislaw Piotr Zankowski, Philippe Marc Vereecken
Nanostructured metals with large surface area have a great potential for multiple device applications. Although various metal architectures based on metal nanoligaments and nanowires are well known, they typically show a tradeoff between mechanical robustness, high surface area and high (macro)porosity, which, when combined, could significantly improve the performance of devices such as batteries, electrolyzers or sensors. In this work we rationally designed templated networks of interconnected metal nanowires, combining for the first time high porosity of metal foams, narrowly-distributed macropores and a very high surface area of nanoporous dealloyed metals...
November 28, 2018: ACS Applied Materials & Interfaces
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