scholarly journals Free-standing graphene oxide mid-infrared polarizers

Nanoscale ◽  
2020 ◽  
Vol 12 (21) ◽  
pp. 11480-11488
Author(s):  
Xiaorui Zheng ◽  
Bing Xu ◽  
Shuo Li ◽  
Han Lin ◽  
Ling Qiu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Extinction Ratio ◽  
Free Standing ◽  
Mid Infrared

Mid-infrared free-standing graphene oxide polarizers with working wavelengths from 2 μm to 14 μm, and an extinction ratio of 20 dB.

scholarly journals Free-standing reduced graphene oxide (rGO) membrane for salt-rejecting solar desalination via size effect

Nanophotonics ◽  
2020 ◽  
Vol 9 (15) ◽  
pp. 4601-4608 ◽  
Author(s):  
Pengyu Zhuang ◽  
Hanyu Fu ◽  
Ning Xu ◽  
Bo Li ◽  
Jun Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Conversion Efficiency ◽  
High Salinity ◽  
Interlayer Spacing ◽  
Structural Instability ◽  
Solar Thermal ◽  
Free Standing ◽  
Solar Desalination ◽  
Reduced Graphene

AbstractInterfacial solar vapor generation has revived the solar-thermal-based desalination due to its high conversion efficiency of solar energy. However, most solar evaporators reported so far suffer from severe salt-clogging problems during solar desalination, leading to performance degradation and structural instability. Here, we demonstrate a free-standing salt-rejecting reduced graphene oxide (rGO) membrane serving as an efficient, stable, and antisalt-fouling solar evaporator. The evaporation rate of the membrane reaches up to 1.27 kg m−2 h−1 (solar–thermal conversion efficiency ∼79%) under one sun, out of 3.5 wt% brine. More strikingly, due to the tailored narrow interlayer spacing, the rGO membrane can effectively reject ions, preventing salt accumulation even for high salinity brine (∼8 wt% concentration). With enabled salt-antifouling capability, flexibility, as well as stability, our rGO membrane serves as a promising solar evaporator for high salinity brine treatment.

scholarly journals Mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Saurabh Dixit ◽  
Nihar Ranjan Sahoo ◽  
Abhishek Mall ◽  
Anshuman Kumar
Keyword(s):  
Room Temperature ◽  
Extinction Ratio ◽  
Polarization State ◽  
Van Der Waals ◽  
Photonic Devices ◽  
Mid Infrared ◽  
Precise Control ◽  
Electromagnetic Simulations ◽  
Frequency Regime ◽  
Sub Wavelength

AbstractMid-infrared (IR) spectral region is of immense importance for astronomy, medical diagnosis, security and imaging due to the existence of the vibrational modes of many important molecules in this spectral range. Therefore, there is a particular interest in miniaturization and integration of IR optical components. To this end, 2D van der Waals (vdW) crystals have shown great potential owing to their ease of integration with other optoelectronic platforms and room temperature operation. Recently, 2D vdW crystals of $$\alpha$$ α -$$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α -$$\hbox {V}_2 \hbox {O}_5$$ V 2 O 5 have been shown to possess the unique phenomenon of natural in-plane biaxial hyperbolicity in the mid-infrared frequency regime at room temperature. Here, we report a unique application of this in-plane hyperbolicity for designing highly efficient, lithography free and extremely subwavelength mid-IR photonic devices for polarization engineering. In particular, we show the possibility of a significant reduction in the device footprint while maintaining an enormous extinction ratio from $$\alpha$$ α -$$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α -$$\hbox {V}_2$$ V 2 $$\hbox {O}_5$$ O 5 based mid-IR polarizers. Furthermore, we investigate the application of sub-wavelength thin films of these vdW crystals towards engineering the polarization state of incident mid-IR light via precise control of polarization rotation, ellipticity and relative phase. We explain our results using natural in-plane hyperbolic anisotropy of $$\alpha$$ α -$$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α -$$\hbox {V}_2$$ V 2 $$\hbox {O}_5$$ O 5 via both analytical and full-wave electromagnetic simulations. This work provides a lithography free alternative for miniaturized mid-infrared photonic devices using the hyperbolic anisotropy of $$\alpha$$ α -$$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α -$$\hbox {V}_2$$ V 2 $$\hbox {O}_5$$ O 5 .

Free-standing and flexible graphene supercapacitors of high areal capacitance fabricated by laser holography reduction of graphene oxide

2021 ◽  
Vol 118 (7) ◽  
pp. 071601
Author(s):  
Xiu-Yan Fu ◽  
Qing Cai ◽  
Jia-Nan Ma ◽  
Lin Zhu ◽  
Dong-Dong Han ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Free Standing ◽  
Areal Capacitance ◽  
Laser Holography

Free-standing ultrathin lithium metal–graphene oxide host foils with controllable thickness for lithium batteries

Nature Energy ◽  
2021 ◽  
Author(s):  
Hao Chen ◽  
Yufei Yang ◽  
David T. Boyle ◽  
You Kyeong Jeong ◽  
Rong Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lithium Batteries ◽  
Lithium Metal ◽  
Free Standing

Highly conductive free-standing reduced graphene oxide thin films for fast photoelectric devices

Carbon ◽  
2017 ◽  
Vol 115 ◽  
pp. 561-570 ◽  
Author(s):  
Hua Yang ◽  
Yang Cao ◽  
Junhui He ◽  
Yue Zhang ◽  
Binbin Jin ◽  
...  
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Oxide Thin Films ◽  
Free Standing ◽  
Reduced Graphene ◽  
Photoelectric Devices
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