{"title":"Metamaterial biosensors for driver monitoring","authors":"","doi":"10.1038/s41928-024-01266-1","DOIUrl":"https://doi.org/10.1038/s41928-024-01266-1","url":null,"abstract":"Monitoring driver alertness could improve road safety, but the use of biosensors in moving vehicles is challenging. Now, a metamaterial biosensor has been designed that can be directly embroidered onto seat belts, enabling the contactless measurement of drivers’ vital signs. This biosensor shows reliable and consistent performance, even in challenging kinetic environments.","PeriodicalId":19064,"journal":{"name":"Nature Electronics","volume":null,"pages":null},"PeriodicalIF":34.3,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142490093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dong Hae Ho, Chenhao Hu, Ling Li, Michael D. Bartlett
{"title":"Soft electronic vias and interconnects through rapid three-dimensional assembly of liquid metal microdroplets","authors":"Dong Hae Ho, Chenhao Hu, Ling Li, Michael D. Bartlett","doi":"10.1038/s41928-024-01268-z","DOIUrl":"https://doi.org/10.1038/s41928-024-01268-z","url":null,"abstract":"<p>The development of soft electronics requires methods to connect flexible and stretchable circuits. With conventional rigid electronics, vias are typically used to electrically connect circuits with multilayered architectures, increasing device integration and functionality. However, creating vias using soft conductors leads to additional challenges. Here we show that soft vias and planar interconnects can be created through the directed stratification of liquid metal droplets with programmed photocuring. Abnormalities that occur at the edges of a mask during ultraviolet exposure are leveraged to create vertical stair-like architectures of liquid metal droplets within the photoresin. The liquid metal droplets in the uncured (liquid) resin rapidly settle, assemble and then are fully cured, forming electrically conductive soft vias at multiple locations throughout the circuit in a parallel and spatially tunable manner. Our three-dimensional selective stratification method can also form seamless connections with planar interconnects, for in-plane and through-plane electrical integration.</p>","PeriodicalId":19064,"journal":{"name":"Nature Electronics","volume":null,"pages":null},"PeriodicalIF":34.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142488522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Twenty years of graphene electronics","authors":"","doi":"10.1038/s41928-024-01290-1","DOIUrl":"10.1038/s41928-024-01290-1","url":null,"abstract":"Graphene devices have undergone substantial development in the past two decades, but introducing new materials into commercial foundries remains problematic.","PeriodicalId":19064,"journal":{"name":"Nature Electronics","volume":null,"pages":null},"PeriodicalIF":33.7,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41928-024-01290-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142488515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Marc Jaikissoon, Çağıl Köroğlu, Jerry A. Yang, Kathryn Neilson, Krishna C. Saraswat, Eric Pop
{"title":"CMOS-compatible strain engineering for monolayer semiconductor transistors","authors":"Marc Jaikissoon, Çağıl Köroğlu, Jerry A. Yang, Kathryn Neilson, Krishna C. Saraswat, Eric Pop","doi":"10.1038/s41928-024-01244-7","DOIUrl":"10.1038/s41928-024-01244-7","url":null,"abstract":"Strain engineering has played a key role in modern silicon electronics, having been introduced as a mobility booster in the 1990s and commercialized in the early 2000s. Achieving similar advances with two-dimensional (2D) semiconductors in a complementary metal–oxide–semiconductor (CMOS)-compatible manner could improve the industrial viability of 2D material transistors. Here, we show that silicon nitride capping layers can impart strain to monolayer molybdenum disulfide (MoS2) transistors on conventional silicon substrates, improving their performance with a CMOS-compatible approach, at a low thermal budget of 350 °C. Strained back-gated and dual-gated MoS2 transistors exhibit median increases in on-state current of up to 60% and 45%, respectively. The greatest improvements are found when reducing both transistor channels and contacts from micrometre-scale to 200 nm, reaching saturation currents of 488 µA µm−1 in devices with just 400 nm contact pitch. Simulations show that the performance enhancement is mainly due to tensile strain lowering the contact Schottky barriers, and that further reducing device dimensions, including contacts, could lead to additional increases in strain and performance. The on-current performance of MoS2-based transistors can be improved by using silicon nitride capping layers that apply strain to the devices.","PeriodicalId":19064,"journal":{"name":"Nature Electronics","volume":null,"pages":null},"PeriodicalIF":33.7,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142487106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"2D transistors feel the strain","authors":"Jinghui Gao, Yuan Liu","doi":"10.1038/s41928-024-01249-2","DOIUrl":"10.1038/s41928-024-01249-2","url":null,"abstract":"CMOS-compatible silicon nitride capping layers can be used to strain monolayer MoS2 transistors on rigid substrates, enhancing their electrical performance.","PeriodicalId":19064,"journal":{"name":"Nature Electronics","volume":null,"pages":null},"PeriodicalIF":33.7,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142487076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yesheng Li, Yao Xiong, Xiaolin Zhang, Lei Yin, Yiling Yu, Hao Wang, Lei Liao, Jun He
{"title":"Memristors with analogue switching and high on/off ratios using a van der Waals metallic cathode","authors":"Yesheng Li, Yao Xiong, Xiaolin Zhang, Lei Yin, Yiling Yu, Hao Wang, Lei Liao, Jun He","doi":"10.1038/s41928-024-01269-y","DOIUrl":"https://doi.org/10.1038/s41928-024-01269-y","url":null,"abstract":"<p>Neuromorphic computing based on memristors could help meet the growing demand for data-intensive computing applications such as artificial intelligence. Analogue memristors with multiple conductance states are of particular use in high-efficiency neuromorphic computing, but their weight mapping capabilities are typically limited by small on/off ratios. Here we show that memristors with analogue resistive switching and large on/off ratios can be created using two-dimensional van der Waals metallic materials (graphene or platinum ditelluride) as the cathodes. The memristors use silver as the top anode and indium phosphorus sulfide as the switching medium. Previous approaches have focused on modulating ion motion using changes to the resistive switching layer or anode, which can lower the on/off ratios. In contrast, our approach relies on the van der Waals cathode, which allows silver ion intercalation/de-intercalation, creating a high diffusion barrier to modulate ion motion. The strategy can achieve analogue resistive switching with an on/off ratio up to 10<sup>8</sup>, over 8-bit conductance states and attojoule-level power consumption. We use the analogue properties to perform the chip-level simulation of a convolutional neural network that offers high recognition accuracy.</p>","PeriodicalId":19064,"journal":{"name":"Nature Electronics","volume":null,"pages":null},"PeriodicalIF":34.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142451826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qihang Zeng, Xi Tian, Dat T. Nguyen, Chenhui Li, Patrick Chia, Benjamin C. K. Tee, Changsheng Wu, John S. Ho
{"title":"A digitally embroidered metamaterial biosensor for kinetic environments","authors":"Qihang Zeng, Xi Tian, Dat T. Nguyen, Chenhui Li, Patrick Chia, Benjamin C. K. Tee, Changsheng Wu, John S. Ho","doi":"10.1038/s41928-024-01263-4","DOIUrl":"https://doi.org/10.1038/s41928-024-01263-4","url":null,"abstract":"<p>Biosensors could be used in vehicles to monitor driver alertness, detect impairment and gauge stress levels. However, measuring biomarkers, such as heart rate and respiration, without physical contact remains a challenge in these environments due to issues related to movement and external interference. Here we report a metamaterial biosensor that can capture cardiopulmonary signals in kinetic environments without being in contact with the body. Fabricated using digital embroidery, the biosensor can be integrated with a safety harness and can detect physiological motion through near-field interactions between wireless signals and the body. We show that the approach is capable of continuous, hour-long recording of heartbeat and respiration in an airline cabin simulator. We also show that the biosensor can operate in a moving car, and exhibits no degradation in accuracy compared with a stationary environment.</p>","PeriodicalId":19064,"journal":{"name":"Nature Electronics","volume":null,"pages":null},"PeriodicalIF":34.3,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}