Standalone stretchable RF systems based on asymmetric 3D microstrip antennas with on-body wireless communication and energy harvesting

Zhang, Senhao; Zhu, Jia; Zhang, Yingying; Chen, Zhensheng; Song, Chaoyun; Li, Jiuqiang; Yi, Ning; Qiu, Dong; Guo, Kai; Zhang, Cheng; Pan, Taisong; Lin, Yuan; Zhou, Honglei; Long, Hao; Hu, Yang; Cheng, Huanyu

doi:10.1016/j.nanoen.2022.107069

Cited by 86 publications

(45 citation statements)

References 47 publications

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“…[216] The stable power supply allows the strain sensor to detect human motions with reliable current readings. It is also possible to integrate the other energy harvesting units [231][232][233] and further store the harvested intermittent energy in supercapacitors or other energy storage modules toward a standalone device system (Figure 11e). [234] The multiple components in this new class of standalone device systems also present challenges in low-cost and scalable manufacturing, which need to be addressed before successful commercialize.…”

Section: Discussionmentioning

confidence: 99%

Surface Wettability for Skin‐Interfaced Sensors and Devices

Wang

Liu

Cheng

et al. 2022

Adv Funct Materials

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The practical applications of skin-interfaced sensors and devices in daily life hinge on the rational design of surface wettability to maintain device integrity and achieve improved sensing performance under complex hydrated conditions. Various bioinspired strategies have been implemented to engineer desired surface wettability for varying hydrated conditions. Although the bodily fluids can negatively affect the device performance, they also provide a rich reservoir of health-relevant information and sustained energy for next-generation stretchable self-powered devices. As a result, the design and manipulation of the surface wettability are critical to effectively control the liquid behavior on the device surface for enhanced performance. The sensors and devices with engineered surface wettability can collect and analyze health biomarkers while being minimally affected by bodily fluids or ambient humid environments. The energy harvesters also benefit from surface wettability design to achieve enhanced performance for powering on-body electronics. This review first summarizes the commonly used approaches to tune the surface wettability for target applications toward skin-interfaced sensors and devices. By considering the existing challenges, one also discusses the opportunities as a small fraction of potential future developments, which can lead to a new class of skin-interfaced devices for use in digital health and personalized medicine.

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Section: Discussionmentioning

confidence: 99%

Surface Wettability for Skin‐Interfaced Sensors and Devices

Wang

Liu

Cheng

et al. 2022

Adv Funct Materials

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“… Application requirements of reconfigurable, flexible RF devices in flexible conformal electronics. ( a ) The concept of a scalable RF system is to communicate wirelessly with the body [ 10 ], Reprinted/adapted with permission from Ref. [ 10 ].…”

Section: Figurementioning

confidence: 99%

“…( a ) The concept of a scalable RF system is to communicate wirelessly with the body [ 10 ], Reprinted/adapted with permission from Ref. [ 10 ]. 2022, Elsevier.…”

Section: Figurementioning

confidence: 99%

“…Miniaturized, highly integrated, flexible RF components act as an essential link between the signal sensing and external wireless communication systems described above, in order to satisfy the demands of multi-band integrated transmission; such flexible RF systems are generally reconfigurable. Figure 1 a,b demonstrate the concept of a scalable RF system used to communicate wirelessly with the body [ 10 ], and an epidermal near field communication (NFC) antenna for neonatal monitoring that can be attached to areas of large skin deformations that result from wrinkling [ 11 ], respectively. As a typical complex, curved structure monitoring application, large area, multi-functional Flexible Smart Skins with conformal antennas and integrated sensors [ 12 ] are shown in Figure 1 c.…”

Section: Introductionmentioning

confidence: 99%

“…As a typical complex, curved structure monitoring application, large area, multi-functional Flexible Smart Skins with conformal antennas and integrated sensors [12] are shown in Figure 1c. The concept of a scalable RF system is to communicate wirelessly with the body [10], Reprinted/adapted with permission from Ref. [10].…”

Section: Introductionmentioning

confidence: 99%

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Recent Advances in Flexible RF MEMS

Shi

Shen

2022

Micromachines

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Microelectromechanical systems (MEMS) that are based on flexible substrates are widely used in flexible, reconfigurable radio frequency (RF) systems, such as RF MEMS switches, phase shifters, reconfigurable antennas, phased array antennas and resonators, etc. When attempting to accommodate flexible deformation with the movable structures of MEMS, flexible RF MEMS are far more difficult to structurally design and fabricate than rigid MEMS devices or other types of flexible electronics. In this review, we survey flexible RF MEMS with different functions, their flexible film materials and their fabrication process technologies. In addition, a fabrication process for reconfigurable three-dimensional (3D) RF devices based on mechanically guided assembly is introduced. The review is very helpful to understand the overall advances in flexible RF MEMS, and serves the purpose of providing a reference source for innovative researchers working in this field.

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Hierarchically Oriented Jellyfish‐Like Gold Nanowires Film for Elastronics

Zhang

Lin

Cheng

et al. 2022

Adv Funct Materials

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Stretchable electronics (i.e., Elastronics) are essential to the realization of next‐generation wearable bioelectronics for personalized medicine, due to their unique skin‐conformal features ideal for seamless integration with the human body. Significant progress has been made to nanowire‐based elastronics with promising applications ranging from electronic‐skin to advanced energy harvest systems. However, it remains a key challenge to rationally control over the nanowire morphology and configurations to achieve desired multifunctionality. Herein, a stretchable jellyfish‐like gold nanowires film with high conductivity and stretchability is presented by using gold nanostar‐seeded nanowire growth method. They exhibit unique hierarchically oriented structure with gold nanostars as the multi‐branched active sites (top layer) and vertically intertwined nanowires (bottom layer) trailing below the nanostars. Such nanowires film can be stretched up to 200% with a retaining low normalized resistance of 13.8 due to the unique hierarchical structure. Furthermore, the film can be used as stretchable supercapacitor with a 92% capacitance retention and superior durability even after 5000 electrochemical scanning cycles. The method is general, which can be further expanded to other metallic seeds, hence, representing a low‐cost yet efficient strategy for the fabrication of stretchable elastronics and robust energy storage devices for on‐body biosensing and bioelectronics.

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Standalone stretchable RF systems based on asymmetric 3D microstrip antennas with on-body wireless communication and energy harvesting

Cited by 86 publications

References 47 publications

Surface Wettability for Skin‐Interfaced Sensors and Devices

Surface Wettability for Skin‐Interfaced Sensors and Devices

Recent Advances in Flexible RF MEMS

Hierarchically Oriented Jellyfish‐Like Gold Nanowires Film for Elastronics

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