Vertically Aligned ZnO Nanowire Arrays for Self-Powered Nanogenerators
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Solution Overview
Problem
Current technologies for powering nanoscale and microscale devices face challenges due to cumbersome wiring and the need for conventional power sources, which are not suitable for portable devices or neuroprosthetics, as they do not harness ambient energy within biosystems.
Innovation Solution
A nanogenerator is developed comprising a substrate, a first electrode layer, a piezoelectric structure, an insulating layer, and a second electrode layer, where vertically-aligned piezoelectric nanostructures are grown to generate a piezoelectric effect that induces an electrical field when deformed by forces, allowing for energy harvesting from ambient sources like biomechanical energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power sources are used to power nanoscale and microscale devices, then the devices can operate reliably, but the wiring becomes cumbersome and the system complexity increases
Solution Approach 1:
The patent implements self-powered nanoscale devices by integrating piezoelectric nanowire generators directly into the device structure. The generator harvests mechanical energy from the device's own operation or environmental sources, eliminating the need for external power sources and complex wiring. This self-service approach allows the device to generate its own power locally through the piezoelectric effect in the nanowire structure.
2Power
If conventional power sources are used in portable devices, then sufficient power can be supplied, but the devices become heavier and less portable
Solution Approach 1:
The patent replaces heavy conventional power sources with lightweight piezoelectric nanowire generators that harvest energy from mechanical deformation or environmental sources. The nanoscale generator structure provides sufficient power for portable applications without adding significant weight, as it converts mechanical energy directly into electrical energy through the piezoelectric effect.
3Power
If conventional power sources are used for neuroprosthetics, then adequate energy can be supplied, but the wiring difficulties become too cumbersome
Solution Approach 1:
The patent applies self-powered piezoelectric nanowire generators directly within neuroprosthetic devices, eliminating the need for external wiring to power sources. The generator harvests biomechanical energy from the patient's body movements or physiological processes, providing local power supply that simplifies the overall system architecture and improves ease of operation.
4Loss of time
If ambient energy harvesting is implemented in nanoscale devices, then self-powered operation is achieved, but the energy harvesting efficiency must be sufficient to meet power demands
Solution Approach 1:
The patent optimizes the piezoelectric nanowire generator parameters including nanowire diameter, length, density, and piezoelectric material properties to maximize energy harvesting efficiency. By carefully controlling these parameters, the generator achieves sufficient power output from ambient mechanical energy to meet the demands of nanoscale devices, enabling self-powered operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The nanogenerator effectively scavenges and stores energy from environmental sources, enabling self-powered, wireless operation of electronic devices, suitable for applications in sensing, infrastructure monitoring, and wireless biosensing with demonstrated output voltage and current levels suitable for data transmission.
Implementation Method 1
when the nanostructures are deformed by a force, the nanostructures piezoelectricly induce an electrical field that influences the second electrode layer
Data Source
AI summary
A generator includes a substrate, a first electrode layer, a dense plurality of vertically-aligned piezoelectric elongated nanostructures, an insulating layer and a second electrode layer. The substrate has a top surface and the first electrode layer is disposed on the top surface of the substrate. The dense plurality of vertically-aligned piezoelectric elongated nanostructures extends from the first electrode layer. Each of the nanostructures has a top end. The insulating layer is disposed on the top ends of the nanostructures. The second electrode layer is disposed on the non-conductive layer and is spaced apart from the nanostructures.