Dynamic molecular tunnel junctions based on self-assembled monolayers for high tunneling current triboelectricity generation

Zhang, Lu; Shalabny, Awad; Chen, Su; Cui, Xin; Sweedan, Amro; Zhang, Kefan; Harilal, Sherina; Sadhujan, Sumesh; Bashouti, Muhammad Y.

doi:10.1039/d2ta10048g

Cited by 6 publications

(5 citation statements)

References 39 publications

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“…In either case, a cross-reactive optimized sensor array might provide a solution to detect the slightest changes in the levels of a mixture of VOCs, as was shown in the results. Furthermore, as the results showed a temporal change in the VOCs, real-time measurement should be conducted in future studies, which may be achievable by a wearable triboelectric-based device, , hence enabling skin–breath comparison. The use of an adsorbent material captures only the cumulative amounts of VOCs released during a 30 min sampling and is limited to identifying the infinitesimal changes during each period.…”

Section: Discussionmentioning

confidence: 99%

Continuous Monitoring of Psychosocial Stress by Non-Invasive Volatilomics

et al. 2023

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Stress is becoming increasingly commonplace in modern times, making it important to have accurate and effective detection methods. Currently, detection methods such as selfevaluation and clinical questionnaires are subjective and unsuitable for long-term monitoring. There have been significant studies into biomarkers such as HRV, cortisol, electrocardiography, and blood biomarkers, but the use of multiple electrodes for electrocardiography or blood tests is impractical for real-time stress monitoring. To this end, there is a need for non-invasive sensors to monitor stress in real time. This study looks at the possibility of using breath and skin VOC fingerprinting as stress biomarkers. The Trier social stress test (TSST) was used to induce acute stress and HRV, cortisol, and anxiety levels were measured before, during, and after the test. GC−MS and sensor array were used to collect and measure VOCs. A prediction model found eight different stress-related VOCs with an accuracy of up to 78%, and a molecularly capped gold nanoparticle-based sensor revealed a significant difference in breath VOC fingerprints between the two groups. These stress-related VOCs either changed or returned to baseline after the stress induction, suggesting different metabolic pathways at different times. A correlation analysis revealed an association between VOCs and cortisol levels and a weak correlation with either HRV or anxiety levels, suggesting that VOCs may include complementary information in stress detection. This study shows the potential of VOCs as stress biomarkers, paving the way into developing a real-time, objective, non-invasive stress detection tool for well-being and early detection of stress-related diseases.

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Section: Discussionmentioning

confidence: 99%

Continuous Monitoring of Psychosocial Stress by Non-Invasive Volatilomics

et al. 2023

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“…In addition to semiconductor materials, the tribo-tunneling effect could also occur between two metal materials, resulting in constant output. Zhang et al developed a high tunneling current DC-TENG based on the metal-insulator-metal contact [194] in 2023 [Figure 8d(i)]. In this DC-TENG, the oligoacene 4-(trifluoromethyl)benzenethiol was grown on the gold electrode as a self-assembled monolayer (SAM) based on the strong electronegativity and outstanding lubricity.…”

Section: Metal/semiconductor-insulator-metal/semiconductor Contactmentioning

confidence: 99%

Direct Current Triboelectric Nanogenerators, a Perspective from Material Selections

Li,

Wei,

Wang

2023

Nanoenergy Advances

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With the global energy shortages, sustainable energy scavenging from the natural environment is desperately needed. Unlike solar cell or wind power, which depends heavily on weather conditions, triboelectric nanogenerator (TENG) has received extensive attention as an efficient all–weather energy–harvesting technology. Based on the coupling principle of contact electrification (CE) and electrostatic induction, conventional TENGs convert mechanical energy into an alternating current (AC) output. However, the typically distributed sensor systems in the ubiquitous Internet of Things (IoTs) request a direct current (DC) input. Direct current triboelectric nanogenerators (DC-TENGs) with the constant output characteristic are critical to satisfy the above requirements. Here, DC-TENGs were reviewed from the perspective of material selections. As device performance is mainly determined by material properties, the development of DC-TENGs could be divided into three categories based on dielectric materials, semiconductor materials, and materials for iontronic rectifications. The operating mechanism and influencing factors of various types of DC-TENG were summarized, representative applications were demonstrated, and the main challenges of future developments were also discussed.

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“…On the other hand, significant attention has been dedicated to wearable electronics, − which play a pivotal role in advancing motion recognition and detection, , human–machine interaction, , and intelligent robotics . Exploring innovative sensitive materials and structural designs represents a time and cost-efficient approach to developing advanced wearable devices with properties of high sensitivity, wide detection range, and enhanced stability and durability. ,− Various sensitive materials have been documented, including zero-dimensional metal nanoparticles, one-dimensional conductive polymer fibers and metal nanowires, , as well as two-dimensional graphene and graphene-like materials. , …”

Section: Introductionmentioning

confidence: 99%

“… 16 Exploring innovative sensitive materials and structural designs represents a time and cost-efficient approach to developing advanced wearable devices with properties of high sensitivity, wide detection range, and enhanced stability and durability. 6 , 17 − 19 Various sensitive materials have been documented, including zero-dimensional metal nanoparticles, 20 one-dimensional conductive polymer fibers and metal nanowires, 21 , 22 as well as two-dimensional graphene and graphene-like materials. 23 , 24 …”

Section: Introductionmentioning

confidence: 99%

Facile Graphene Oxide Modification Method via Hydroxyl-yne Click Reaction for Ultrasensitive and Ultrawide Monitoring Pressure Sensors

Hu,

Lu,

Zheng

et al. 2024

ACS Appl. Mater. Interfaces

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Enhancing the durability and functionality of existing materials through sustainable pathways and appropriate structural design represents a time-and costeffective strategy for the development of advanced wearable devices. Herein, a facile graphene oxide (GO) modification method via the hydroxyl-yne click reaction is present for the first time. By the click coupling between propiolate esters and hydroxyl groups on GO under mild conditions, various functional molecules are successfully grafted onto the GO. The modified GO is characterized by FTIR, XRD, TGA, XPS, and contact angle, proving significantly improved dispersibility in various solvents. Besides the high efficiency, high selectivity, and mild reaction conditions, this method is highly practical and accessible, avoiding the need for prefunctionalizations, metals, or toxic reagents. Subsequently, a rGO-PDMS sponge-based piezoresistive sensor developed by modified GO-P2 as the sensitive material exhibits impressive performance: high sensitivity (335 kPa −1 , 0.8−150 kPa), wide linear range (>500 kPa), low detection limit (0.8 kPa), and long-lasting durability (>5000 cycles). Various practical applications have been demonstrated, including body joint movement recognition and real-time monitoring of subtle movements. These results prove the practicality of the methodology and make the rGO-PDMS sponge-based pressure sensor a real candidate for a wide array of wearable applications.

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Dynamic molecular tunnel junctions based on self-assembled monolayers for high tunneling current triboelectricity generation

Abstract: Efficient conversion of mechanical energy into electric energy with sufficient d.c. current density remains great potential for power supplying electronics. However, the conventional triboelectric nanogenerators still face critical challenges mainly...

Cited by 6 publications

References 39 publications

Continuous Monitoring of Psychosocial Stress by Non-Invasive Volatilomics

Continuous Monitoring of Psychosocial Stress by Non-Invasive Volatilomics

Direct Current Triboelectric Nanogenerators, a Perspective from Material Selections

Facile Graphene Oxide Modification Method via Hydroxyl-yne Click Reaction for Ultrasensitive and Ultrawide Monitoring Pressure Sensors

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