Nano/Micro and Bio-Inspired Materials on Wide-Bandgap-Semiconductor-Based Optoelectronic/Power Devices

This Special Issue on “Nano/Micro and Bio-Inspired Materials on Wide-Bandgap-Semiconductor-Based Optoelectronic/Power Devices” is a collection of 20 original articles dedicated to theoretical and experimental research works providing new insights and practical findings in the field of solid-state technology-related topics [...]

RANCANG BANGUN COOLER BOX BERBASIS TERMOELEKTRIK DENGAN VARIASI HEATSINK

Pendingin termoelektrik merupakan solid state technology yang bisa menjadi alternatif teknologi pendingin pengganti sistem vapor compression. Salah satu komponen dari pendingin termoelektrik adalah heatsink yang pemasangannya paling sering digunakan untuk keandalan dan pengaturan termal suatu rangkaian. Adapun tujuan dilakukannya penelitian ini adalah dihasilkan mesin pendingin berupa cooler box termoelektrik dengan daya listrik yang rendah, menganalisa kinerja termoelektrik pada cooler box sehingga dapat ditentukan pemilihan heatsink terbaik yang digunakan pada cooler box. Penelitian dilakukan dengan melakukan perancangan dan perakitan cooler box berbahan plastik berukuran 150 mm x 150 mm x 210 mm ,modul termoelektrik TEC-12706 , sumber listrik power supply 12V, 20 A dan heatsink aluminium yang divariasikan. Pengujian pada cooler box thermoelektrik dilakukan selama 120 menit dan dapat disimpulkan bahwa hasil terbaik dengan menggunakan heatsink berukuran 100mm x 120mm x 35mm, konsumsi daya listrik 19.6 W, beda temperatur sebesar 29.7oC, kalor yang diserap pada sisi dingin 20.1 W, kalor yang dilepas pada sisi panas sebesar 39.7 W, temperatur ruang pendingin 18.75oC dan COP sebesar 0.57.

The solid-state in situ construction of Cu2O/CuO heterostructures with adjustable phase compositions to promote CO oxidation activity

Cu2O/CuO heterojunctions were fabricated via in situ solid-state technology. Tuning the ratio of reactants enables optimization of the components of the Cu2O/CuO heterostructures and their catalytic activities for CO oxidation.

Shedding Light on the Anthropogenic Europium Cycle in the EU–28. Marking Product Turnover and Energy Progress in the Lighting Sector

Phase-out strategies for incandescent bulbs in favor of advanced energy-efficiency lighting systems such as fluorescent lamps and solid-state technology have considerably reduced the energy use for lighting, but have also resulted in dependence on many critical materials like rare earth elements and shifted the attention to sustainable use and recovery of resources. In this work, a dynamic material flow model was developed to analyze the socio-economic metabolism of europium in the EU–28. The analysis shows that europium marked product turnover and progress in lighting efficiency, with this element being employed both in traditional and novel lighting technology to provide luminescence. The results also demonstrate that the current anthropogenic reserve could constitute an attractive source of secondary europium with substantial potentials for environmental benefits. However, nonexistent recycling and market forces hinder strategies for material circularity. In particular, the transition from fluorescent lamps to solid-state technology is quickly decreasing the demand for europium. This trend adds further constraints to the creation of a sustainable recycling industry for europium, with primary sources that might remain the preferable route to supply phosphors to future lighting systems.