Accompanying with the continuous development of human–interface technology, various electronic devices should be planted or attached to the human body. These applications should have self-powered feature because they need to be supplied with stable and continuous energy sources. Therefore, energy ha...
Accompanying with the continuous development of human–interface technology, various electronic devices should be planted or attached to the human body. These applications should have self-powered feature because they need to be supplied with stable and continuous energy sources. Therefore, energy harvesting technologies, which convert small mechanical energy of body movement to electrical energy, such as piezoelectric and triboelectric energy harvesters have been developed.
Particularly, triboelectric generators (TENGs) can produce much higher electrical outputs and energy density than other energy harvesting types. Moreover, triboelectric devices can be manufactured at low cost and an easy processing with most of materials even including liquid phases. Triboelectric effect occurs in numerous materials, including polymers, ceramics, and metals, which have been used as triboelectric charging surfaces in various previous studies for triboelectric devices.
However, it is difficult to develop a flexible, light, transparent, and even imperceptible device applications in line with the development of future wearable self-powered electronics. So, two-dimensional (2D) nanomaterials (e.g., graphene, boron nitride (BN), molybdenum disulfide (MoS_(2)), etc.) have been studied for next-generation electronics in diverse fields of flexible and wearable electronics.
In the area of triboelectric energy harvesting, a few triboelectric surfaces devices using 2D nanomaterials have been demonstrated by exfoliation or chemical vapor deposition (CVD) methods. However, there are some critical limitations such as the unreliable controllability for morphology or the restricted processability for large areas, short time, vacuum-less condition, and low cost. In addition, surface physic plays a crucial role in triboelectric energy harvesters and sensors, but the study for the morphological effects of 2D nanomaterials on triboelectric devices is very rare.
Herein, atomically thin 2D MoS_(2) layers were compounded using pulsed laser-directed thermolysis with chemical solution. Moreover, the morphology of laser-directed MoS_(2) layers can be modified from flat to crumpled surfaces by modulating the laser power. The morphological change results from interfacial cavities caused by the laser-assisted wrinkles of the underlying SiO_(2) thin film layer on the mother Si wafer.
Subsequently, the morphologically tunable MoS_(2) layers are well investigated by various material characterization such as scanning electron microscope (SEM), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), piezoelectric force microscopy (PFM) and so on.
To study the triboelectric energy harvesting efficiency of 2D MoS_(2) layers, triboelectric nanogenerators have been fabricated using the different laser-directed 2D MoS_(2) layers. The flat MoS_(2) TENG produces electric signals of ~17 V, 0.85 μA and 2.4 μW whereas the crumpled MoS_(2) TENG generates ~ 25 V, 1.2 μA and 1.6 μW, respectively. In triboelectric energy harvesting output, the crumpled MoS_(2) TENG generates ~40% more power than the flat MoS_(2) TENG device. This is due to not only the increased surface area of the MoS_(2) layers but also the involved charges of interfacial cavities beneath the underlying SiO_(2) layer.
Lastly, the laser-directed pattern of crumpled-MoS_(2) layers was transferred on to an PDMS (or Ecoflex™) elastomeric substrate to achieve self-powered wearable touch pads. The crumpled-MoS_(2) based tactile sensor array well detects the touch of fingers or other objects. Our research will accelerate the limitations research of 2D nanomaterials to overcome morphological limitations in the field of triboelectric energy harvesters and self-powered devices with the noteworthy laser-directed synthesis for fast, patternable and non-vacuum processing.
Accompanying with the continuous development of human–interface technology, various electronic devices should be planted or attached to the human body. These applications should have self-powered feature because they need to be supplied with stable and continuous energy sources. Therefore, energy harvesting technologies, which convert small mechanical energy of body movement to electrical energy, such as piezoelectric and triboelectric energy harvesters have been developed.
Particularly, triboelectric generators (TENGs) can produce much higher electrical outputs and energy density than other energy harvesting types. Moreover, triboelectric devices can be manufactured at low cost and an easy processing with most of materials even including liquid phases. Triboelectric effect occurs in numerous materials, including polymers, ceramics, and metals, which have been used as triboelectric charging surfaces in various previous studies for triboelectric devices.
However, it is difficult to develop a flexible, light, transparent, and even imperceptible device applications in line with the development of future wearable self-powered electronics. So, two-dimensional (2D) nanomaterials (e.g., graphene, boron nitride (BN), molybdenum disulfide (MoS_(2)), etc.) have been studied for next-generation electronics in diverse fields of flexible and wearable electronics.
In the area of triboelectric energy harvesting, a few triboelectric surfaces devices using 2D nanomaterials have been demonstrated by exfoliation or chemical vapor deposition (CVD) methods. However, there are some critical limitations such as the unreliable controllability for morphology or the restricted processability for large areas, short time, vacuum-less condition, and low cost. In addition, surface physic plays a crucial role in triboelectric energy harvesters and sensors, but the study for the morphological effects of 2D nanomaterials on triboelectric devices is very rare.
Herein, atomically thin 2D MoS_(2) layers were compounded using pulsed laser-directed thermolysis with chemical solution. Moreover, the morphology of laser-directed MoS_(2) layers can be modified from flat to crumpled surfaces by modulating the laser power. The morphological change results from interfacial cavities caused by the laser-assisted wrinkles of the underlying SiO_(2) thin film layer on the mother Si wafer.
Subsequently, the morphologically tunable MoS_(2) layers are well investigated by various material characterization such as scanning electron microscope (SEM), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), piezoelectric force microscopy (PFM) and so on.
To study the triboelectric energy harvesting efficiency of 2D MoS_(2) layers, triboelectric nanogenerators have been fabricated using the different laser-directed 2D MoS_(2) layers. The flat MoS_(2) TENG produces electric signals of ~17 V, 0.85 μA and 2.4 μW whereas the crumpled MoS_(2) TENG generates ~ 25 V, 1.2 μA and 1.6 μW, respectively. In triboelectric energy harvesting output, the crumpled MoS_(2) TENG generates ~40% more power than the flat MoS_(2) TENG device. This is due to not only the increased surface area of the MoS_(2) layers but also the involved charges of interfacial cavities beneath the underlying SiO_(2) layer.
Lastly, the laser-directed pattern of crumpled-MoS_(2) layers was transferred on to an PDMS (or Ecoflex™) elastomeric substrate to achieve self-powered wearable touch pads. The crumpled-MoS_(2) based tactile sensor array well detects the touch of fingers or other objects. Our research will accelerate the limitations research of 2D nanomaterials to overcome morphological limitations in the field of triboelectric energy harvesters and self-powered devices with the noteworthy laser-directed synthesis for fast, patternable and non-vacuum processing.
주제어
#Laser synthesis 2D materials Transition Metal Dichalcogenide Triboelectric nanogenerator Touch sensor 레이저 합성법 2차원 물질 전이금속 디칼코게나이드 이황화몰리브덴 마찰전기 나노발전기 터치 센서
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