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https://www.readbyqxmd.com/read/29139287/a-high-performance-self-powered-photodetector-based-on-perovskite-and-graphene
#1
Juan Li, Shihao Yuan, Guanqi Tang, Guijun Li, Dan Liu, Jing Li, Xihong Hu, Yucheng Liu, Jianbo Li, Zhou Yang, Shengzhong Frank Liu, Zhike Liu, Fei Gao, Feng Yan
An ideal photodetector must have a fast response, a wide tunable spectral response, be highly responsive, low power consumption and a facile fabrication process. In this work, a self-powered photodetector with a graphene electrode and pervoskite photoactive layer is assembled for the first time. The graphene electrode is prepared using a solution transfer process, and perovskite using a solution coating process, which makes the device low-cost. The graphene can form a schottky junction with TiO2 to efficiently transfer electrons from perovskite to TiO2, and acts as an efficient hole-extraction layer to let the holes quickly transport to electrode...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29134796/enhanced-electrical-and-optoelectronic-characteristics-of-few-layer-type-ii-snse-mos2-van-der-waals-heterojunctions
#2
Shengxue Yang, Minghui Wu, Bin Wang, Li-Dong Zhao, Li Huang, Chengbao Jiang, Su-Huai Wei
Van der Waals heterojunctions formed by stacking various two-dimensional (2D) materials have a series of attractive physical properties, thus offering an ideal platform for versatile electronic and optoelectronic applications. Here, we report few-layer SnSe/MoS2 van der Waals heterojunctions and study their electrical and optoelectronic characteristics. The new heterojunctions present excellent electrical transport characteristics with a distinct rectification effect and a high current on/off ratio (~ 1 × 105)...
November 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29125613/control-of-electro-chemical-processes-using-energy-harvesting-materials-and-devices
#3
REVIEW
Yan Zhang, Mengying Xie, Vana Adamaki, Hamideh Khanbareh, Chris R Bowen
Energy harvesting is a topic of intense interest that aims to convert ambient forms of energy such as mechanical motion, light and heat, which are otherwise wasted, into useful energy. In many cases the energy harvester or nanogenerator converts motion, heat or light into electrical energy, which is subsequently rectified and stored within capacitors for applications such as wireless and self-powered sensors or low-power electronics. This review covers the new and emerging area that aims to directly couple energy harvesting materials and devices with electro-chemical systems...
November 10, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/29111642/a-stretchable-and-transparent-nanocomposite-nanogenerator-for-self-powered-physiological-monitoring
#4
Xiaoliang Chen, Kaushik Parida, Jiangxin Wang, Jiaqing Xiong, Meng-Fang Lin, Jinyou Shao, Pooi-See Lee
Smart sensing electronic device with good transparency, high stretchability and self-powered sensing characteristics are essential in wearable health monitoring systems. This paper innovatively proposes a stretchable nanocomposite nanogenerator with good transparency that can be conformally attached on human body to harvest biomechanical energy and monitor physiological signals. The work reports an innovative device that uses sprayed silver nanowires as transparent electrodes and sandwiches a nanocomposite of piezoelectric BaTiO3 and PDMS as the sensing layer, which exhibits good transparency and mechanical transformability with stretchable, foldable, and twistable properties...
November 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29109447/opto-electric-investigation-for-si-organic-heterojunction-single-nanowire-solar-cells
#5
Zhenhai Yang, Zhaolang Liu, Jiang Sheng, Wei Guo, Yuheng Zeng, Pingqi Gao, Jichun Ye
Recently, silicon single nanowire solar cells (SNSCs) serving as the sustainable self-power sources have been integrated into optoelectronic nanodevices under the driver of technology and economy. However, conventional SNSC cannot provide the minimum energy consumption for the operation of nanodevices due to its low power conversion efficiency (PCE). Here, we propose an innovative approach to combine the n-type silicon nanowires (SiNWs) with p-type poly(3,4-ethylthiophene):poly(styrenesulfonate) (PEDOT:PSS) to form the p (+) n heterojunction, which shows superior opto-electric performances...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29099172/a-target-triggered-dnazyme-motor-enabling-homogeneous-amplified-detection-of-proteins
#6
Junbo Chen, Albert Zuehlke, Bin Deng, Hanyong Peng, Xiandeng Hou, Hongquan Zhang
We report here the concept of a self-powered, target-triggered DNA motor constructed by engineering a DNAzyme to adapt into binding-induced DNA assembly. An affinity ligand was attached to the DNAzyme motor via a DNA spacer, and a second affinity ligand was conjugated to the gold nanoparticle (AuNP) that was also decorated with hundreds of substrate strands serving as a high-density, three-dimensional track for the DNAzyme motor. Binding of a target molecule to the two ligands induced hybridization between the DNAzyme and its substrate on the AuNP, which are otherwise unable to spontaneously hybridize...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29076297/recent-progress-of-self-powered-sensing-systems-for-wearable-electronics
#7
REVIEW
Zheng Lou, La Li, Lili Wang, Guozhen Shen
Wearable/flexible electronic sensing systems are considered to be one of the key technologies in the next generation of smart personal electronics. To realize personal portable devices with mobile electronics application, i.e., wearable electronic sensors that can work sustainably and continuously without an external power supply are highly desired. The recent progress and advantages of wearable self-powered electronic sensing systems for mobile or personal attachable health monitoring applications are presented...
October 27, 2017: Small
https://www.readbyqxmd.com/read/29063762/highly-efficient-moisture-triggered-nanogenerator-based-on-graphene-quantum-dots
#8
Yaxin Huang, Huhu Cheng, Gaoquan Shi, Liangti Qu
A high-performance moisture triggered nanogenerator is fabricated by using graphene quantum dots (GQDs) as the active material. GQDs are prepared by direct oxidation and etching of natural graphite powder, which have small sizes of 2-5 nm and abundant oxygen-containing functional groups. After the treatment by electrochemical polarization, the GQDs-based moisture triggered nanogenerator can deliver a high voltage up to 0.27 V under 70% relative humidity variation, and a power density of 1.86 mW cm(-2) with an optimized load resistor...
November 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29060598/a-wearable-autonomous-heart-rate-sensor-based-on-piezoelectric-charge-gated-thin-film-transistor-for-continuous-multi-point-monitoring
#9
Ahmed Rasheed, Emad Iranmanesh, Weiwei Li, Hai Ou, Andrey S Andrenko, Kai Wang
Autonomous wearable biomedical sensors enable continuous human body vital signs monitoring with features such as being conformable, mobile, cost-effective and self-powered. In this work, we report on an autonomous and multi-positional sensor capable of heart rate and blood pressure monitoring. The device concept is based on a piezoelectric-charge-gated thin-film transistor (PCGTFT) where a polyvinylidene fluoride (PVDF) piezoelectric sandwich structure is incorporated with an amorphous silicon (a-Si:H) dual-gate TFT (DGTFT)...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29059797/a-self-powered-glucose-biosensor-based-on-pyrolloquinoline-quinone-glucose-dehydrogenase-and-bilirubin-oxidase-operating-under-physiological-conditions
#10
Tanmay Kulkarni, Gymama Slaughter
A novel biosensing system capable of simultaneously sensing glucose and powering portable electronic devices such as a digital glucometer is described. The biosensing system consists of enzymatic glucose biofuel cell bioelectrodes functionalized with pyrolloquinoline quinone glucose dehydrogenase (PQQ-GDH) and bilirubin oxidase (BOD) at the bioanode and biocathode, respectively. A dual-stage power amplification circuit is integrated with the single biofuel cell to amplify the electrical power generated. In addition, a capacitor circuit was incorporated to serve as the transducer for sensing glucose...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29058800/on-skin-triboelectric-nanogenerator-and-self-powered-sensor-with-ultrathin-thickness-and-high-stretchability
#11
Xiangyu Chen, Yali Wu, Jiajia Shao, Tao Jiang, Aifang Yu, Liang Xu, Zhong Lin Wang
Researchers have devoted a lot of efforts on pursuing light weight and high flexibility for the wearable electronics, which also requires the related energy harvesting devices to have ultrathin thickness and high stretchability. Hence, an elastic triboelectric nanogenerator (TENG) is proposed that can serve as the second skin on human body. The total thickness of this TENG is about 102 µm and the device can work durably under a strain of 100%. The carbon grease is painted on the surface of elastomer film to work as stretchable electrode and thus the fine geometry control of the electrode can be achieved...
October 23, 2017: Small
https://www.readbyqxmd.com/read/29058793/photovoltaic-pyroelectric-coupled-effect-induced-electricity-for-self-powered-photodetector-system
#12
Nan Ma, Kewei Zhang, Ya Yang
Ferroelectric materials have demonstrated novel photovoltaic effect to scavenge solar energy. However, most of the ferroelectric materials with wide bandgaps (2.7-4 eV) suffer from low power conversion efficiency of less than 0.5% due to absorbing only 8-20% of solar spectrum. Instead of harvesting solar energy, these ferroelectric materials can be well suited for photodetector applications, especially for sensing near-UV irradiations. Here, a ferroelectric BaTiO3 film-based photodetector is demonstrated that can be operated without using any external power source and a fast sensing of 405 nm light illumination is enabled...
October 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29041359/variable-self-powered-light-detection-cmos-chip-with-real-time-adaptive-tracking-digital-output-based-on-a-novel-on-chip-sensor
#13
HongYi Wang, Youyou Fan, Zhijian Lu, Tao Luo, Houqiang Fu, Hongjiang Song, Yuji Zhao, Jennifer Blain Christen
This paper provides a solution for a self-powered light direction detection with digitized output. Light direction sensors, energy harvesting photodiodes, real-time adaptive tracking digital output unit and other necessary circuits are integrated on a single chip based on a standard 0.18 µm CMOS process. Light direction sensors proposed have an accuracy of 1.8 degree over a 120 degree range. In order to improve the accuracy, a compensation circuit is presented for photodiodes' forward currents. The actual measurement precision of output is approximately 7 ENOB...
October 2, 2017: Optics Express
https://www.readbyqxmd.com/read/29039642/self-powered-nanocomposites-under-an-external-rotating-magnetic-field-for-noninvasive-external-power-supply-electrical-stimulation
#14
Fengluan Wu, Long Jin, Xiaotong Zheng, Bingyun Yan, Pandeng Tang, Huikai Yang, Weili Deng, Weiqing Yang
Electrical stimulation in biology and gene expression has attracted considerable attention in recent years. However, it is inconvenient that the electric stimulation needs to be supplied an implanted power-transported wire connecting the external power supply. Here, we fabricated a self-powered composite nanofiber (CNF) and developed an electric generating system to realize electrical stimulation based on the electromagnetic induction effect under an external rotating magnetic field. The self-powered CNFs generating an electric signal consist of modified MWNTs (m-MWNTs) coated Fe3O4/PCL fibers...
November 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29021591/highly-sensitive-self-powered-and-wearable-electronic-skin-based-on-pressure-sensitive-nanofiber-woven-fabric-sensor
#15
Yuman Zhou, Jianxin He, Hongbo Wang, Kun Qi, Nan Nan, Xiaolu You, Weili Shao, Lidan Wang, Bin Ding, Shizhong Cui
The wearable electronic skin with high sensitivity and self-power has shown increasing prospects for applications such as human health monitoring, robotic skin, and intelligent electronic products. In this work, we introduced and demonstrated a design of highly sensitive, self-powered, and wearable electronic skin based on a pressure-sensitive nanofiber woven fabric sensor fabricated by weaving PVDF electrospun yarns of nanofibers coated with PEDOT. Particularly, the nanofiber woven fabric sensor with multi-leveled hierarchical structure, which significantly induced the change in contact area under ultra-low load, showed combined superiority of high sensitivity (18...
October 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29018210/magnetic-nanoparticle-reduced-graphene-oxide-nanocomposite-as-a-novel-bioelectrode-for-mediatorless-membraneless-glucose-enzymatic-biofuel-cells
#16
Saithip Pakapongpan, Adisorn Tuantranont, Rungtiva P Poo-Arporn
In this work, an enzymatic biofuel cell (EBC) based on a membraneless and mediatorless glucose enzymatic fuel cell system was constructed for operation in physiological conditions (pH 7.0 and temperature 37 °C). The new platform EBC made of nanocomposite, including magnetic nanoparticles (Fe3O4 NPs) and reduced graphene oxide (RGO), was used for the immobilization of glucose oxidase (GOD) as bioanode and bilirubin oxidase (BOD) as biocathode. The EBC bioelectrodes were fabricated without binder or adhesive agents for immobilized enzyme and the first EBC using superparamagnetic properties with Fe3O4 NPs has been reported...
October 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28991402/self-powered-nanoscale-photodetectors
#17
REVIEW
Wei Tian, Yidan Wang, Liang Chen, Liang Li
Novel self-powered nanoscale photodetectors that can work without an external power source, which have great application potential in next-generation nanodevices that operate wirelessly and independently, are being widely studied. This review aims to give a comprehensive summary of the state-of-the-art research results on self-powered nanoscale photodetectors. An introduction of recent progress on Schottky junction photodetectors is provided. Two types of Schottky junctions are discussed in detail: metal-semiconductor and semiconductor-graphene junctions...
October 9, 2017: Small
https://www.readbyqxmd.com/read/28983108/low-temperature-growth-of-hydrogenated-amorphous-silicon-carbide-solar-cell-by-inductively-coupled-plasma-deposition-toward-high-conversion-efficiency-in-indoor-lighting
#18
Ming-Hsuan Kao, Chang-Hong Shen, Pei-Chen Yu, Wen-Hsien Huang, Yu-Lun Chueh, Jia-Min Shieh
A p-a-SiC:H window layer was used in amorphous Si thin film solar cells to boost the conversion efficiency in an indoor lighting of 500 lx. The p-a-SiC:H window layer/p-a-Si:H buffer layer scheme moderates the abrupt band bending across the p/i interface for the enhancement of VOC, JSC and FF in the solar spectra of short wavelengths. The optimized thickness of i-a-Si:H absorber layer is 400 nm to achieve the conversion efficiency of ~9.58% in an AM1.5 G solar spectrum. However, the optimized thickness of the absorber layer can be changed from 400 to 600 nm in the indoor lighting of 500 lx, exhibiting the maximum output power of 25...
October 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28980732/printable-fabrication-of-nanocoral-structured-electrodes-for-high-performance-flexible-and-planar-supercapacitor-with-artistic-design
#19
Yuanjing Lin, Yuan Gao, Zhiyong Fan
Planar supercapacitors with high flexibility, desirable operation safety, and high performance are considered as attractive candidates to serve as energy-storage devices for portable and wearable electronics. Here, a scalable and printable technique is adopted to construct novel and unique hierarchical nanocoral structures as the interdigitated electrodes on flexible substrates. The as-fabricated flexible all-solid-state planar supercapacitors with nanocoral structures achieve areal capacitance up to 52.9 mF cm(-2) , which is 2...
October 5, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28975779/solar-blind-photodetector-with-high-avalanche-gains-and-bias-tunable-detecting-functionality-based-on-metastable-phase-%C3%AE-ga2o3-zno-isotype-heterostructures
#20
Xuanhu Chen, Yang Xu, Dong Zhou, Sen Yang, Fang-Fang Ren, Hai Lu, Kun Tang, Shulin Gu, Rong Zhang, Youdou Zheng, Jiandong Ye
The metastable α-phase Ga2O3 is an emerging material for developing solar-blind photodetectors and power electronic devices toward civil and military applications. Despite its superior physical properties, the high quality epitaxy of metastable phase α-Ga2O3 remains challenging. To this end, single crystalline α-Ga2O3 epilayers are achieved on nonpolar ZnO (112̅0) substrates for the first time and a high performance Au/α-Ga2O3/ZnO isotype heterostructure-based Schottky barrier avalanche diode is demonstrated...
October 11, 2017: ACS Applied Materials & Interfaces
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