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This thesis explores the development of Zinc Oxide (ZnO) nanogenerators for low-frequency energy harvesting applications. Eiman Satti Nour investigates the use of piezoelectric nanomaterials to create self-powered systems that convert ambient mechanical vibrations into electrical energy. The research focuses on fabricating ZnO nanowires on flexible substrates for various applications such as handwriting-enabled energy harvesting, footstep sensors, and anisotropic directional sensors. The study highlights the potential of ZnO nanogenerators in wireless sensor networks and discusses challenges and future opportunities. The intended audience includes researchers and professionals in nanotechnology and energy harvesting fields.

Nanogenerators. --- Energy harvesting.

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This book focuses on both fundamental and applied research on nanogenerators. The triboelectric nanogenerator (TENG) is based on expanded Maxwell’s equations for a mechano-driven system, including the polarization density term Ps in a displacement vector owing to the electrostatic charges on medium surfaces as produced by effects such as triboelectrification. The TENGs have potential applications in blue energy, wearable devices, environmental protectioin, medical science, and security. Hybridized and coupled nanogenerators further expand the application of nanogenerators in energy stability and multi-functional sensing.

triboelectric nanogenerator --- network --- blue energy --- wave energy --- energy harvesting --- surface engineering --- surface morphology --- surface modification --- enhanced performance --- human–machine interface (HMI) --- triboelectric nanogenerator (TENG) --- artificial intelligence (AI) --- robot perception --- wearable sensor --- Internet of things (IoT) --- Beaufort scale monitoring --- near-zero power --- wake-up system --- triboelectric sensor --- ferroelectric materials --- nanogenerators --- piezoelectricity --- triboelectricity --- pyroelectricity --- bulk ferroelectric photovoltaic effect (BPVE) --- harvesting --- coupled effects --- mechanical conversion --- mechanical transmission --- triboelectric nanogenerators (TENGs) --- external mechanical system control --- regulated output --- uniform output --- stretchable electronic skin --- self-powered sensing --- human motion monitoring --- thermoplastic polyurethane fibers --- biosensors --- hybridization --- piezoelectric nanogenerator --- electromechanical conversion --- self-powered --- cell modulation --- smart textiles --- triboelectric nanogenerators --- electricity generation --- output enhancement --- air breakdown --- lubricant liquid --- mechanical lifespan

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This book focuses on both fundamental and applied research on nanogenerators. The triboelectric nanogenerator (TENG) is based on expanded Maxwell’s equations for a mechano-driven system, including the polarization density term Ps in a displacement vector owing to the electrostatic charges on medium surfaces as produced by effects such as triboelectrification. The TENGs have potential applications in blue energy, wearable devices, environmental protectioin, medical science, and security. Hybridized and coupled nanogenerators further expand the application of nanogenerators in energy stability and multi-functional sensing.

Technology: general issues --- triboelectric nanogenerator --- network --- blue energy --- wave energy --- energy harvesting --- surface engineering --- surface morphology --- surface modification --- enhanced performance --- human–machine interface (HMI) --- triboelectric nanogenerator (TENG) --- artificial intelligence (AI) --- robot perception --- wearable sensor --- Internet of things (IoT) --- Beaufort scale monitoring --- near-zero power --- wake-up system --- triboelectric sensor --- ferroelectric materials --- nanogenerators --- piezoelectricity --- triboelectricity --- pyroelectricity --- bulk ferroelectric photovoltaic effect (BPVE) --- harvesting --- coupled effects --- mechanical conversion --- mechanical transmission --- triboelectric nanogenerators (TENGs) --- external mechanical system control --- regulated output --- uniform output --- stretchable electronic skin --- self-powered sensing --- human motion monitoring --- thermoplastic polyurethane fibers --- biosensors --- hybridization --- piezoelectric nanogenerator --- electromechanical conversion --- self-powered --- cell modulation --- smart textiles --- triboelectric nanogenerators --- electricity generation --- output enhancement --- air breakdown --- lubricant liquid --- mechanical lifespan

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Fossil fuels leaded the 21st century industrial revolution but caused some critical problems such as exhaustion of resources and global warming. Also, current power plants require too much high cost and long time for establishment and facilities to provide electricity. Thus, developing new power production systems with environmental friendliness and low-cost is critical global needs. There are some emerging energy harvesting technologies such as thermoelectric, piezoelectric, and triboelectric nanogenerators, which have great advantages on eco-friendly low-cost materials, simple fabrication, and various operating sources. Since the introduction of various energy harvesting technologies, many novel designs and applications as power suppliers and physical sensors in the world have been demonstrated based on their unique advantages. In this Special Issue, we would like to address and share basic approaches, new designs, and industrial applications related to thermoelectric, piezoelectric, and triboelectric devices which are on-going in Korea. With this Special Issue, we aim to promote fundamental understanding and to find novel ways to achieve industrial product manufacturing for energy harvesters.

triboelectric nanogenerators --- n/a --- carbon nanotube --- mesoporous composite polymer --- organic composites --- railroad vehicle --- rolling stock --- suspension system --- remnant polarization --- water wave energy --- oxygen vacancy --- energy harvesting --- PVDF --- thermoelectric --- high dielectric constant --- advanced driver assistance technology --- thin film --- sensor --- wireless chemical sensor --- energy-harvesting metamaterial --- metamaterial sensor --- thermoelectric generator --- nanoimprinting --- superhydrophobic surface --- layer-by-layer --- high deformability --- metal oxidation --- IoT technology --- TiO_2?x nanoparticle --- spray method --- piezoelectric --- graphene --- shock absorber --- ferroelectric --- frictional force --- axle bearing --- femtosecond laser --- carbon nanotubes --- mechanical energy --- polymers --- mechanical fatigue resistance --- gapless --- power factor --- nanostructures --- triboelectric generator --- hybrid energy --- microstructures --- triboelectric nanogenerator

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Fossil fuels leaded the 21st century industrial revolution but caused some critical problems such as exhaustion of resources and global warming. Also, current power plants require too much high cost and long time for establishment and facilities to provide electricity. Thus, developing new power production systems with environmental friendliness and low-cost is critical global needs. There are some emerging energy harvesting technologies such as thermoelectric, piezoelectric, and triboelectric nanogenerators, which have great advantages on eco-friendly low-cost materials, simple fabrication, and various operating sources. Since the introduction of various energy harvesting technologies, many novel designs and applications as power suppliers and physical sensors in the world have been demonstrated based on their unique advantages. In this Special Issue, we would like to address and share basic approaches, new designs, and industrial applications related to thermoelectric, piezoelectric, and triboelectric devices which are on-going in Korea. With this Special Issue, we aim to promote fundamental understanding and to find novel ways to achieve industrial product manufacturing for energy harvesters.

triboelectric nanogenerators --- carbon nanotube --- mesoporous composite polymer --- organic composites --- railroad vehicle --- rolling stock --- suspension system --- remnant polarization --- water wave energy --- oxygen vacancy --- energy harvesting --- PVDF --- thermoelectric --- high dielectric constant --- advanced driver assistance technology --- thin film --- sensor --- wireless chemical sensor --- energy-harvesting metamaterial --- metamaterial sensor --- thermoelectric generator --- nanoimprinting --- superhydrophobic surface --- layer-by-layer --- high deformability --- metal oxidation --- IoT technology --- TiO_2?x nanoparticle --- spray method --- piezoelectric --- graphene --- shock absorber --- ferroelectric --- frictional force --- axle bearing --- femtosecond laser --- carbon nanotubes --- mechanical energy --- polymers --- mechanical fatigue resistance --- gapless --- power factor --- nanostructures --- triboelectric generator --- hybrid energy --- microstructures --- triboelectric nanogenerator --- triboelectric nanogenerators --- carbon nanotube --- mesoporous composite polymer --- organic composites --- railroad vehicle --- rolling stock --- suspension system --- remnant polarization --- water wave energy --- oxygen vacancy --- energy harvesting --- PVDF --- thermoelectric --- high dielectric constant --- advanced driver assistance technology --- thin film --- sensor --- wireless chemical sensor --- energy-harvesting metamaterial --- metamaterial sensor --- thermoelectric generator --- nanoimprinting --- superhydrophobic surface --- layer-by-layer --- high deformability --- metal oxidation --- IoT technology --- TiO_2?x nanoparticle --- spray method --- piezoelectric --- graphene --- shock absorber --- ferroelectric --- frictional force --- axle bearing --- femtosecond laser --- carbon nanotubes --- mechanical energy --- polymers --- mechanical fatigue resistance --- gapless --- power factor --- nanostructures --- triboelectric generator --- hybrid energy --- microstructures --- triboelectric nanogenerator