Wearable near‐field communication bracelet based on highly conductive graphene‐assembled films

Li, Siting; Song, Rongguo; Zhang, Bohan; Bangqi, Huang; Zhao, Xin; He, Daping

doi:10.1002/mmce.22479

Cited by 9 publications

(8 citation statements)

References 25 publications

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“…The GAF NFC tag demonstrates exceptional robustness, exhibiting a reading range of 3.4 cm when attached to the human body, ensuring high levels of security and privacy. Furthermore, experimental validation confirms that GAF NFC tags can serve as electronic keys and business cards (Figure e and f), capable of being worn by individuals for work purposes, thereby holding significant potential for wireless body area networks . To broaden the application scope of RFID tags, we devised a GAF dual-frequency RFID tag (Figure g).…”

Section: Rf and Microwave Electronics Based On Graphene Assembled Filmmentioning

confidence: 89%

“…Furthermore, experimental validation confirms that GAF NFC tags can serve as electronic keys and business cards (Figure 5e and f), capable of being worn by individuals for work purposes, thereby holding significant potential for wireless body area networks. 45 To broaden the application scope of RFID tags, we devised a GAF dual-frequency RFID tag (Figure 5g). Without increasing the physical dimensions of the RFID tag, we integrate the NFC function into the UHF tag structure.…”

Section: Rfidmentioning

confidence: 99%

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Graphene Assembled Films for Radio Frequency and Microwave Technology

Song,

Zhang,

et al. 2024

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS:With the rapid advancement of information technology, an era of intelligence where seamless interconnectivity prevails is coming. The Internet of Everything (IoE) relies on efficient data transmission, wherein radio frequency (RF) and microwave technologies play a pivotal role. RF and microwave technologies spawn extensive applications in mobile communication, radar systems, remote sensing, and other fields. Traditional conductive materials in RF and microwave electronics include copper, gold, and other metals. However, conventional metal-based electronics are constrained by inherent challenges such as susceptibility to oxidation, high density, restricted heat dissipation capacity, and insustainability, thereby impeding their ability to fulfill the requirements of next-generation RF and microwave electronics. Graphene assembled films emerge as a promising class of carbon materials with excellent electrical and thermal conductivity alongside remarkable mechanical stability, chemical inertness, and low density, which are highly suitable for utilization in RF and microwave electronics applications. RF and microwave electronics based on a graphene assembled film exhibit comparable electrical performance to the metallic materials while offering additional advantages such as lightweight, flexibility, corrosion resistance, enhanced heat dissipation efficiency, and fatigue resistance. These distinguished properties enable electronics to adapt to intelligent environments with high integration levels. Therefore, the application of the graphene assembled film has significantly advanced the progress in RF and microwave technology, facilitating metal-substitution.In this Account, we primarily summarize our efforts toward developing the utilization of graphene assembled film (GAF) within the realm of electronics in RF and microwave technology. Through material optimization, device design, and processing technology iteration, we have successfully implemented GAF electronics in wireless communication, wearable systems, electromagnetic protection, and the intelligent control of electromagnetic waves in RF and microwave technology. First, we introduce the advanced properties of graphene and present an overview of the fabrication methods for GAF, including coating, vacuum filtration, and graphene oxide film reducing, highlighting exceptional electrical, mechanical, and thermal properties of GAF, as well as the feasibility of metal substitution. Subsequently, we extensively discuss the application of GAF in radio frequency and microwave technology from various perspectives, encompassing antenna and antenna arrays, flexible electronics, radio frequency identification (RFID) devices, and metasurfaces. GAF-based electronics not only inherit the exceptional lightweight, flexible, corrosion resistance, and fatigue resistance characteristics of GAF but also exhibit superior electrical properties, such as low radiation sidelobe and wide working bandwidth, surpassing the conventional metal-ba...

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Section: Rf and Microwave Electronics Based On Graphene Assembled Filmmentioning

confidence: 89%

Section: Rfidmentioning

confidence: 99%

Graphene Assembled Films for Radio Frequency and Microwave Technology

Song,

Zhang,

et al. 2024

Acc. Mater. Res.

Self Cite

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“…The graphene-assembled films are fabricated by the following four steps [29]: Firstly, graphene oxide (GO) slurry was diluted with ultrapure water to obtain the GO suspension with concentration of 15 mg/mL. Then, the GO suspension was scraped onto a polyethylene terephthalate (PET) substrate and then evaporated to obtain the GO assembly films.…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, the metal mesh conductive sheet is too expensive and prone to oxidation [14], the conductive ink normally has low conductivity which is not suitable for antenna design [15][16][17], and the carbon nanotube also has a relatively high sheet resistance, resulting from junction resistance and is not possible to produce large-area film [18]. Recently, graphene-assembled films with the advantages of high conductivity, good bending resistance and good chemical stability have been considered as a promising alternative conductive material for antenna [19][20][21], sensor [22][23][24] and other RF applications [25,26], which show great potential in overcoming the challenges of conformal antenna design [27][28][29]. It is worth noting that most of these flexible antennas are single-band and their bending angle is greatly limited.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Band Conformal Antenna Based on Highly Conductive Graphene-Assembled Films for 5G WLAN Applications

Xiao

Jiang

et al. 2021

Materials

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Flexible electronic devices are widely used in the Internet of Things, smart home and wearable devices, especially in carriers with irregular curved surfaces. Light weight, flexible and corrosion-resistant carbon-based materials have been extensively investigated in RF electronics. However, the insufficient electrical conductivity limits their further application. In this work, a flexible and low-profile dual-band Vivaldi antenna based on highly conductive graphene-assembled films (GAF) is proposed for 5G Wi-Fi applications. The proposed GAF antenna with the profile of 0.548 mm comprises a split ring resonator and open circuit half wavelength resonator to implement the dual band-notched characteristic. The operating frequency of the flexible GAF antenna covers the Wi-Fi 6e band, 2.4–2.45 GHz and 5.15–7.1 GHz. Different conformal applications are simulated by attaching the antenna to the surface of cylinders with different radii. The measured results show that the working frequency bands and the radiation patterns of the GAF antenna are relatively stable, with a bending angle of 180°. For demonstration of practical application, the GAF antennas are conformed to a commercial router. The spectral power of the GAF antenna router is greater than the copper antenna router, which means a higher signal-to-noise ratio and a longer transmission range can be achieved. All results indicate that the proposed GAF antenna has broad application prospects in next generation Wi-Fi.

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“…[26][27][28][29] In addition, as a carbon material, graphene has better chemical stability and adaptability to harsh environments than its metal counterparts. 30 Due to the excellent flexibility of graphene, it has been used in various wearable antennas such as pressure sensor, 31 ultra-wideband antenna, 32 nearfield communication (NFC) tag antenna, 33 dual-band conformal antenna, 34 and millimeter wave antenna array, 35 which proves that graphene can be used in flexible devices.…”

Section: Introductionmentioning

confidence: 99%

Conformal metal crack detection sensor based on flexible graphene film antenna

Tong

Song

Guan

et al. 2022

Int J RF Mic Comp-Aid Eng

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Crack detection of metal structures is an important procedure to ensure the safe operation of metal structures. In this work, a metal crack sensor based on a highly conductive flexible graphene film is proposed. The sensor is designed based on conformal microstrip antenna composed of a flexible graphene film radiation patch and a flexible dielectric substrate. The prepared sensor exhibited a detection sensitivity of 36.82 MHz/mm demonstrated by both experimental and simulation results. Moreover, benefiting from the flexible nature of the graphene film, the proposed sensor shows good conformality which makes up the shortcoming of the traditional rigid crack detection device.

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Wearable near‐field communication bracelet based on highly conductive graphene‐assembled films

Cited by 9 publications

References 25 publications

Graphene Assembled Films for Radio Frequency and Microwave Technology

Graphene Assembled Films for Radio Frequency and Microwave Technology

A Dual-Band Conformal Antenna Based on Highly Conductive Graphene-Assembled Films for 5G WLAN Applications

Conformal metal crack detection sensor based on flexible graphene film antenna

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