The deployment of wireless sensor networks (WSNs) for the internet of things (IoT) and remote monitoring devices has made tremendous progress in the last few years. At the same time, energy harvesters are also being developed to satisfy the power requirement of WSNs and other low power consumption electronics, to increase the device operating time and overcome the limitations of conventional electric power supplies, including batteries. Among various resources for energy harvesting, the magnetic noise produced by power transmission infrastructures and associated mechanical vibrations are ubiquitous energy sources that could be converted into electricity by high efficiency energy conversion materials or devices. Electro-magnetic energy conversion systems that operate on the principle of Faraday’s induction law can provide sufficient power from strong magnetic fields. However, under weak magnetic fields with low frequency such as 50/60 Hz, the power generated from an electromagnetic device is disappointingly small. Alternative energy harvesting technologies with high power density and small device volume/dimensions are obviously necessary for WSNs of IoT. Recently FMDL developed the concept of an emerging magnetic energy harvesting technology, the so-called magneto-mechano-electric (MME) generators. MME generators utilize the magnetoelectric (ME) coupling in composites of piezoelectric and magnetostrictive materials and interaction between the proof magnet mass and magnetic field. Since the piezoelectric phase in the composite also responds to mechanical vibration directly, an ME-based energy harvester can harness energy from both mechanical vibrations and magnetic fields simultaneously. This combination is expected to enhance the total power output and conversion efficiency. The MME generator can be a ubiquitous power source for WSNs, low power electronic devices, and wireless charging systems by harvesting energy from the tiny magnetic fields pre-sent as parasitic magnetic noise in an ambient environment.
Recent technological advances in developing a diverse range of lasers have opened new avenues in material processing. Laser processing of materials involves their exposure to rapid and localized energy, which creates conditions of electronic and thermodynamic none quilibrium. The laser induced heat can be localized in space and time, enabling excellent control over the manipulation of materials. Metal oxides are of significant interest for applications ranging from microelectronics to medicine. Numerous studies have investigated the synthesis, manipulation, and patterning of metal oxide films and nanostructures.
Granule Spray in Vacuum (GSV) process is the process to fabricate thick and dense ceramic film at room temperature (RT), based on impact collision of solid ceramic particles. This technique can provide crack-free dense thin and thick films with thicknesses ranging from sub micrometer to several hundred micrometers with very fast deposition rates. In addition, this technique is using pure solid particles (without any liquid phase) to form the ceramic films at RT, there is few limitation of the substrate and easy to control the compositions of the ceramic films. FMDL is working on this process for various kinds of functional ceramic thick films for electronic, mechanical, environmental, energy, and biomedical applications since 2005. Our target applications of functional ceramic thick films by AD/GSV include piezoelectrics, dielectrics, solid electrolytes, thermoelectrics, biomaterials, photocatalyst, and etc.