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Xunjia Li

Bio: Xunjia Li is an academic researcher from Zhejiang University. The author has contributed to research in topics: Triboelectric effect & Nanogenerator. The author has an hindex of 11, co-authored 24 publications receiving 501 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a kind of highly electronegative and conducting material of MXene nanosheet has been innovatively integrated with polyvinyl alcohol (PVA) for electrospinning nanofibers film to fabricate flexible all-electrospun triboelectric nanogenerator (TENG).

282 citations

Journal ArticleDOI
TL;DR: In this paper, the state-of-the-art of carbon nanomaterial-enabled electrochemical sensors in nitrite detection in the past years (2014-2018) is presented.
Abstract: Nitrite is widely found in the natural environment and human life, but the abuse and potential toxicity of nitrite poses a great threat to human health. Therefore, it is necessary to develop effective, robust, and reliable methods for nitrite detection. Carbon nanomaterials have shown their great potential in the development of high-performance electrochemical sensors in view of their numerous fascinating properties. Carbon nanomaterial-enabled electrochemical sensors have been regarded as one of the most promising detection tools for nitrite due to their high sensitivity, simplicity of operation, and excellent selectivity. In this review, we introduce the state-of-art of carbon nanomaterial-enabled electrochemical sensors in nitrite detection in the past years (2014–2018). The properties and advantages of carbon nanotubes, graphene, graphene oxide, carbon nanofibers, carbon nanodots, nanodiamonds, and nanoporous carbon in the development of nitrite sensors are discussed in details. Furthermore, the challenges and prospects for the application of carbon nanomaterial-enabled electrochemical sensors for nitrite analysis are also included.

145 citations

Journal ArticleDOI
TL;DR: In this article, a highly flexible and effective triboelectric nanogenerator based on MXene and polydimethylsiloxane composite (PDMS/MXene) film and laser-induced graphene (LIG) electrode is presented.

133 citations

Journal ArticleDOI
TL;DR: In this article, a sandwich-structured stretchable device is fabricated, where a composite film is encapsulated in two layers of polydimethylsiloxane (PDMS), and it can serve as a stretchable triboelectric nanogenerator (STENG).

83 citations

Journal ArticleDOI
TL;DR: A smart plant-wearable biosensor which can be applied for in-situ analysis of organophosphorus pesticide on crop surfaces and can selectively capture and recognize the methyl parathion and the data can be transmitted to a smartphone device wirelessly, which enable the real-time and in-Situ electrochemical analysis of pesticide on the surface of agricultural products.

80 citations


Cited by
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Journal ArticleDOI
TL;DR: A critical review is presented on the current state of the arts of wearable fiber/fabric-based piezoelectric nanogenerators and triboelectrics with respect to basic classifications, material selections, fabrication techniques, structural designs, and working principles, as well as potential applications.
Abstract: Integration of advanced nanogenerator technology with conventional textile processes fosters the emergence of textile-based nanogenerators (NGs), which will inevitably promote the rapid development and widespread applications of next-generation wearable electronics and multifaceted artificial intelligence systems. NGs endow smart textiles with mechanical energy harvesting and multifunctional self-powered sensing capabilities, while textiles provide a versatile flexible design carrier and extensive wearable application platform for their development. However, due to the lack of an effective interactive platform and communication channel between researchers specializing in NGs and those good at textiles, it is rather difficult to achieve fiber/fabric-based NGs with both excellent electrical output properties and outstanding textile-related performances. To this end, a critical review is presented on the current state of the arts of wearable fiber/fabric-based piezoelectric nanogenerators and triboelectric nanogenerators with respect to basic classifications, material selections, fabrication techniques, structural designs, and working principles, as well as potential applications. Furthermore, the potential difficulties and tough challenges that can impede their large-scale commercial applications are summarized and discussed. It is hoped that this review will not only deepen the ties between smart textiles and wearable NGs, but also push forward further research and applications of future wearable fiber/fabric-based NGs.

729 citations

Journal ArticleDOI
TL;DR: The 2D transition metal carbides or nitrides, known as MXenes, are a new family of 2D materials with close to 30 members experimentally synthesized and dozens more theoretically investigated.
Abstract: 2D transition metal carbides or nitrides, known as MXenes, are a new family of 2D materials with close to 30 members experimentally synthesized and dozens more theoretically investigated. Because o...

353 citations

Journal ArticleDOI
07 Feb 2021-ACS Nano
TL;DR: In this paper, an organ-like Ti3C2Tx MXene/metal-organic framework-derived copper oxide (CuO) gas sensor was powered by a triboelectric nanogenerator (TENG) based on latex and polytetrafluoroethylene for the detection of ammonia (NH3) at room temperature.
Abstract: Self-powered sensors are crucial in the field of wearable devices and the Internet of Things (IoT). In this paper, an organ-like Ti3C2Tx MXene/metal-organic framework-derived copper oxide (CuO) gas sensor was powered by a triboelectric nanogenerator (TENG) based on latex and polytetrafluoroethylene for the detection of ammonia (NH3) at room temperature. The peak-to-peak value of open-circuit voltage and short-circuit current generated by the prepared TENG can reach up to 810 V and 34 μA, respectively. The TENG can support a maximum peak power density of 10.84 W·m-2 and light at least 480 LEDs. Moreover, a flexible TENG under a single-electrode working mode was demonstrated for human movement stimulation, which exhibits great potential in wearable devices. The self-powered NH3 sensor driven by TENG has an excellent response (Vg/Va = 24.8 @ 100 ppm) at room temperature and exhibits a great potential in monitoring pork quality. Ti3C2Tx MXene and CuO were characterized by SEM, TEM, EDS, XRD, and XPS to analyze the properties of the materials. The NH3 sensing performance of the self-powered sensor based on MXene/CuO was greatly improved, and the mechanism of the enhanced sensing properties was systematically discussed.

299 citations

Journal ArticleDOI
TL;DR: The facile fabrication of a highly sensitive and reliable capacitive pressure sensor (CPS) for ultralow-pressure measurement and a good candidate for a next-generation human-machine interfacing device is reported.
Abstract: In recent years, highly sensitive pressure sensors that are flexible, biocompatible, and stretchable have attracted significant research attention in the fields of wearable electronics and smart skin. However, there has been a considerable challenge to simultaneously achieve highly sensitive, low-cost sensors coupled with optimum mechanical stability and an ultralow detection limit for subtle physiological signal monitoring devices. Targeting aforementioned issues, herein, we report the facile fabrication of a highly sensitive and reliable capacitive pressure sensor for ultralow-pressure measurement by sandwiching MXene (Ti3C2Tx)/poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) composite nanofibrous scaffolds as a dielectric layer between biocompatible poly-(3,4-ethylenedioxythiophene) polystyrene sulfonate /polydimethylsiloxane electrodes. The fabricated sensor exhibits a high sensitivity of 0.51 kPa-1 and a minimum detection limit of 1.5 Pa. In addition, it also enables linear sensing over a broad pressure range (0-400 kPa) and high reliability over 10,000 cycles even at extremely high pressure (>167 kPa). The sensitivity of the nanofiber-based sensor is enhanced by MXene loading, thereby increasing the dielectric constant up to 40 and reducing the compression modulus to 58% compared with pristine PVDF-TrFE nanofiber scaffolds. The proposed sensor can be used to determine the health condition of patients by monitoring physiological signals (pulse rate, respiration, muscle movements, and eye twitching) and also represents a good candidate for a next generation human-machine interfacing device.

215 citations