Ni–Co–Mn multi-component metal oxides with various morphologies were controllably synthesized on carbon cloth for high-performance supercapacitor electrodes.
Helical carbon nanofibers (HCNFs) coated-carbon fibers (CFs) were fabricated by catalytic chemical vapor deposition method. TEM and Raman spectroscopy characterizations indicate that the graphitic layers of the HCNFs changed from disorder to order after high temperature annealing. The electromagnetic parameters and microwave absorption properties were measured at 2–18 GHz. The maximum reflection loss is 32 dB at 9 GHz and the widest bandwidth under −10 dB is 9.8 GHz from 8.2 to 18 GHz for the unannealed HCNFs coated-CFs composite with 2.5 mm in thickness, suggesting that HCNFs coated-CFs should have potential applications in high performance microwave absorption materials
O 7 nanophosphors were synthesized via a facile sol-gel process. The samples were characterized by the inductively coupled plasma atomic emission spectrometer (ICP-AES), X-ray diffraction (XRD), transmission electron microscopy (TEM), and infrared-to-visible upconversion (UC) luminescence spectra. XRD analysis showed that the crystallization temperature of pyrochore-type Y 2 Ti 2 O 7 was reduced due to the flux effect of Li + ions, whereas TEM measurements confirmed that the particles size of (Y 0.815 Er 0.01 Yb 0.075 Li 0.10 ) 2 Ti 2 O 7 was about 30-40 nm when calcining at 800°C for 1.0 h. The calcining temperature and Li + ion concentration dependence on UC luminescence spectra were investigated. It was found that, when incorporating 10.0 mol% Li + ion, the UC red and green emission intensity was drastically increased by a factor of 18.6 and 8.3, respectively. The enhancement of UC emission may be mainly attributed to the modification of local symmetry around Er 3+ ions by tridoping Li + ions. And also, the pump power dependence of the emission intensity was investigated to understand the fundamental UC mechanism.A. Srivastava-contributing editor Manuscript No. 31924.
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