Search query: Nitrogen-doped graphene based triboelectric nanogenerators

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abstract: Abstract Harvesting all sources of available clean energy is an essential strategy to contribute to healing current dependence on non sustainable energy sources. Recently, triboelectric nanogenerators (TENGs) have gained visibility as new mechanical energy harvester offering a valid alternative to batteries, being particularly suitable for portable devices. Here, the increased capacitance of a few layer graphene based electrode is obtained by incorporating nitrogen doped graphene (N graphene) enabling a 3 fold enhancement in TENGs' power output. The dependence of TENGs' performance on the electronic properties of different N graphene types, varying in the doping concentration and in the relative content of N pyridinic and N graphitic sites is investigated. These sites have different electron affinities, and synergistically contribute to the variation of the capacitive and resistive properties of N graphene and consequently, TENG performance. It is demonstrated that the power enhancement of the TENG occurs when the N graphene, an n semiconductor, is interfaced between the positive triboelectric material and the electrode, while a deterioration of the electrical performance is observed when it is placed at the interface with the negative triboelectric material. This behavior is explained in terms of the dependence of N graphene quantum capacitance on the electrode chemical potential which shifts according to the opposite polarization induced at the two electrodes upon triboelectrification.
author_names: Giuseppina Pace

Michele Serri

Antonio Esau Del Rio Castillo

Alberto Ansaldo

Simone Lauciello

Mirko Prato

Lea Pasquale

Jan Luxa

Vlastimil Maz'anek

Zdenek Sofer

Francesco Bonaccorso
title: Nitrogen doped graphene based triboelectric nanogenerators
year: 2021

author_names: Zhaoxiang Liu

Zhizhen Zhao

Xiangwen Zeng

Xiuli Fu

Youfan Hu
title: Ultrathin, flexible and transparent graphene based triboelectric nanogenerators for attachable curvature monitoring
venue: Journal of Physics D: Applied Physics
year: 2019

abstract: Abstract Zinc oxide (ZnO) acting as a versatile material for electronic and optoelectronic devices shows promising applications in triboelectric nanogenerator (TENG) based self powered electronics. However, the output performances of ZnO based TENG are relatively low and the origin of contact electrification in the ZnO based TENG is unclear. Here, we fabricate a TENG by using ZnO film and polyimide (PI) acting as positive and negative friction layers, respectively. The work function of the ZnO film is modified by doping with elemental Al, and the conductivity of the ZnO film is additionally enhanced by the presence of graphene oxide sheets. The output performance is greatly improved and it is sensitive to the work function of ZnO film. These results reveal that electron transfer is the dominant process in contact electrification for ZnO based TENGs. This work provides significant insight into understanding the contact electrification properties of ZnO, thus allowing optimization of ZnO based self powered devices.
author_names: Dianlun Li

Chaoxing Wu

Lu Ruan

Jiaxin Wang

Zhirong Qiu

Kun Qi Wang

Ye Liu

Yufei Zhang

Tailiang Guo

Jintang Lin

Tae Whan Kim
title: Electron transfer mechanisms for confirmation of contact electrification in ZnO/polyimide based triboelectric nanogenerators
year: 2020

abstract: The energy crisis and the rise of flexible electronics call for a renewable and flexible energy source due to the inconvenience of the traditional power supply. A triboelectric nanogenerator (TENG)
author_names: Huamin Chen

Shaochun Zhang

Yuxiao Zou

Cheng Zhang

Biao Zheng

Chunlei Huang

Bingwen Zhang

Chao Xing

Yun Xu

Jianglong Wang
title: Performance Enhanced Flexible Triboelectric Nanogenerator Based on Gold Chloride Doped Graphene
year: 2020

abstract: High demand for green and eco friendly triboelectric nanogenerators (TENGs) have multiplied the importance of their degradability for biomedical applications. However, the charge generation of the current eco friendly TENGs is generally limited. In this research, a flexible TENG based on Silk fibroin (SF) fibrous layer and polycaprolactone (PCL)/graphene oxide (GO) fibrous layer was developed. Moreover, PCL/GO layer was surface modified using various concentrations of GO (0, 1.5, 3, 6 and 9 wt% We demonstrated that surface modification using GO nanosheets significantly improved the output of TENG. Noticeably, the optimized GO modified layer resulted in the voltage of 100 V, current of 3.15 mA/ and power density of 72 mW/ Moreover, a thin PCL layer applied as the encapsulation layer does not significantly modulate the performance of the TENG. Furthermore, during 28 days of soaking in a buffer phosphate solution, the proposed TENG could successfully generate electricity. The TENG was also proposed for electrical stimulation of PC12 cells. Results confirmed that this self powered electrical stimulator could promote the attachment and proliferation of PC12 cells. Therefore, an eco friendly and cost effective TENG based on GO modified PCl/GO and silk fibrous layers shows potential to be used as a power source for biomedical applications.
author_names: Samira Parandeh

Mahshid Kharaziha

Fathallah Karimzadeh

Farzad Hosseinabadi
title: Triboelectric nanogenerators based on graphene oxide coated nanocomposite fibers for biomedical applications.
venue: Nanotechnology
year: 2020

abstract: A triboelectric nanogenerator (TENG) electrode sensitive to the adsorption of water molecules has been introduced to create a self powered humidity sensor. Graphene oxide (GO) nanosheets and graphene oxide nanoribbon (GONR) possessing oxygenated functional groups, as well as high dielectric constants, have been proposed as appropriate candidates for this purpose. GO papers have been fabricated in three forms, i.e. pure GO paper, uniform composites of GONR and GO, and double layer structures of GONR on top of GO. Results showed that all of the prepared paper based TENGs revealed excellent performances by maximum output voltage above 300 V. As active humidity sensors, the maximum voltage response values of 57% 124% and 78% were obtained for GO, GONR+GO, and GONR/GO TENGs, respectively. Besides high sensitivity and precision of all variants, GO+GONR TENG demonstrated a rapid response/recovery behavior (0.3/0.5 s) This phenomenon can be attributed to the higher oxygenated groups and defects on the edges of GONR, which leads to facilitating the bulk diffusion of water molecules. Our results open new avenues of GONR application as an additive to enhance the performance of self powered humidity sensors, as well as conventional hygrometers.
author_names: Faezeh Ejehi

Raheleh Mohammadpour

Elham Asadian

Somayeh Fardindoost

Pezhman Sasanpour
title: Enhancement of self powered humidity sensing of graphene oxide based triboelectric nanogenerators by addition of graphene oxide nanoribbons
venue: Microchimica Acta
year: 2021

abstract: Nowadays, great effort has been devoted to establishing wearable electronics with excellent stretchability, high sensitivity, good mechanical strength and multifunctional characteristics. Herein, a soft conductive hydrogel is rationally designed by proportionally mixing silk fibroin, polyacrylamide, graphene oxide and poly(3,4 ethylenedioxythiophene):poly(styrene sulfonate) The resultant hydrogel has considerable stretchability and compressibility, which enables to be assembled into a strain/pressure sensor with a wide sensing range (strain: 2% 600% pressure: 0.5 kPa 119.4 kPa) and reliable stability. Then, the corresponding sensor is capable to monitor a series of physical signals of human body (e.g. joint movement, facial gesture, pulse, breathing, etc. Especially, the hydrogel based sensor is biocompatible with no anaphylactic reaction on human skin. More interestingly, this conductive hydrogel exhibits positive response when it works in a triboelectric nanogenerator, consequently lighting up 20 commercial green light emitting diodes. Thus, this silk fibroin based hydrogel is a kind of multifunctional material towards wearable electronics with versatile applications in health and exercise monitors, soft robots and power source.
author_names: Faliang He

Xingyan You

Hao Gong

Yun Yang

Tian Bai

Weiguo Wang

Wenxi Guo

Meidan Ye
title: Stretchable, Biocompatible and Multifunctional Silk Fibroin based Hydrogels towards Wearable Strain/Pressure Sensors and Triboelectric Nanogenerators.
venue: ACS applied materials interfaces
year: 2020

abstract: Abstract In this research, an eco friendly triboelectric nanogenerator (TENG) with high output performance based on poly(caprolactone) (PCL)/graphene oxide (GO) and cellulose paper was developed. PCL/GO fibrous layers consisting of various concentrations of GO nanosheets (0, 0.5, 1, 2, 4 and 8 wt% were fabricated using a cost effective and simple electrospinning approach. Moreover, the role of GO concentration as well as the topography, thickness, and size of friction layers on the triboelectric performance was investigated. We realized that PCL/4 wt% GO cellulose paper produced an open circuit voltage, current density and maximum power density up to 120 V, 2.5 mA/m2 and 72.5 mW/m2, respectively. Results demonstrated that this open circuit voltage was 33% greater than that of flat PCL/4 wt% GO layer, confirming the role of the fibrous structure to promote charge density accumulation. Moreover, a 98% increase in the open circuit voltage was calculated for the TENG containing PCL 4 wt% GO with the dimension of 4 x 4 cm2. The output of triboelectric nanogenerator, driven by human hand tapping, was enough to light up at least 21 blue light emitting diodes (LEDs) continuously. This higher performance was attributed to the formation of nanopores and strengthened negative charges on PCL from the fibrous structure and oxygen functional groups of GO, respectively. We believed that the suggested triboelectric nanogenerator with high performance, low cost and easy fabrication process, as well as biocompatibility, has the potential to be applied for eco friendly power sources to resolve the electronic waste issue and for self powered biomedical devices.
author_names: Samira Parandeh

Mahshid Kharaziha

Fathallah Karimzadeh
title: An eco friendly triboelectric hybrid nanogenerators based on graphene oxide incorporated polycaprolactone fibers and cellulose paper
venue: Nano Energy
year: 2019

abstract: Abstract Triboelectric nanogenerator (TENG) as a promising energy source, has attracted widespread attention for wearable applications due to its outstanding characteristics. Many approaches have been applied to improve the output performance. However, as an important development tendency, the stretchability and power density of stretchable TENG are far away from practical application. In this study, we developed a performance enhanced stretchable TENG based stretchable crumpled graphene (CG) The CG based TENG could generate output performance of 83.0 V and 25.78 mA. While the power density is 0.25 mW/cm2, which is 20 times over that of planar graphene based TENG. It was found that the output performance was proportional to the crumple degree. The remarkable enhancement is contributed to not only the enhanced effective contact area and surface roughness, but larger work function difference. This discovery provides a novel and simple physical method to control the work function of two dimensional material. The stretchable TENG could withstand large strain up to 120% while the output performance was quite stable. It could harvest energy under various complex deformation encountered in practical wearable situations. This work investigated the effect of crumple nanostructure on the performance of TENG and demonstrated a performance enhanced highly stretchable TENG, which proves a potential approach to developing practical stretchable TENG for wearable applications.
author_names: Huamin Chen

Yun Xu

Jiushuang Zhang

Weitong Wu

Guofeng Song
title: Enhanced stretchable graphene based triboelectric nanogenerator via control of surface nanostructure
venue: Nano Energy
year: 2019

abstract: Abstract Wearable mechanical energy harvesting technologies have been achieved much attention for the wireless sustainable power source applications. In this study, we have fabricated polyvinylidene fluoride (PVDF)/graphene quantum dot (GQD) composite nanofibers (NFs) which showed improved triboelectric nanogenerator (TENG) performance. PVDF/GQD composite NFs were fabricated by an electrospinning method. Structural and chemical investigations show that the GQDs were embedded in the PVDF NFs and promoted the formation of polar b phase when an optimal amount of GQDs was incorporated. The PVDF/GQD NFs showed strong photoluminescence at a wavelength of 453 nm, which was attributed to the electronic transitions in the GQDs. As the GQD content increased from 0 to 5 vol% the maximum output power from TENG devices increased from 35 to 97 mW but decreased with further additions of GQDs. The enhancement and degradation of the TENG performance with increasing the GQD contents were due to the enhanced formation of polar b phase and the detrimental effect of conductive GQDs for charge trapping, respectively.
author_names: Geon-Ju Choi

Seong-Ho Baek

Sang-Seok Lee

Firoz Shah Tuglak Khan

Jae Hyun Kim

I K Park
title: Performance enhancement of triboelectric nanogenerators based on polyvinylidene fluoride/graphene quantum dot composite nanofibers
venue: Journal of Alloys and Compounds
year: 2019