Novel vertically aligned nanocomposite of Bi2WO6-Co3O4 with room-temperature multiferroic and anisotropic optical response

The stabilization of black-phase formamidinium lead iodide (α-FAPbI3) perovskite under various environmental conditions is considered necessary for solar cells. However, challenges remain regarding the temperature sensitivity of α-FAPbI3 and the requirements for strict humidity control in its processing. Here we report the synthesis of stable α-FAPbI3, regardless of humidity and temperature, based on a vertically aligned lead iodide thin film grown from an ionic liquid, methylamine formate. The vertically grown structure has numerous nanometer-scale ion channels that facilitate the permeation of formamidinium iodide into the lead iodide thin films for fast and robust transformation to α-FAPbI3. A solar cell with a power-conversion efficiency of 24.1% was achieved. The unencapsulated cells retain 80 and 90% of their initial efficiencies for 500 hours at 85°C and continuous light stress, respectively.

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Vertically Aligned Few-Layered Graphene-Based Non-Cryogenic Bolometer

C – Journal of Carbon Research ◽

10.3390/c5020023 ◽

2019 ◽

Vol 5 (2) ◽

pp. 23 ◽

Cited By ~ 1

Author(s):

Anil K. Yadav ◽

Saba Mehsar Khan ◽

Anirban Kundu ◽

Renu Rani ◽

Navneet Soin ◽

...

Keyword(s):

Room Temperature ◽

Thermal Coefficient ◽

Carbon Nanomaterial ◽

Electrical Switching ◽

Current Voltage ◽

Infra Red ◽

Vertically Aligned ◽

Thermal Coefficient Of Resistance ◽

Probe Measurements ◽

Bolometric Effect

In this study, we report the photoresponse of vertically aligned few-layered graphene (VAG) upon infra-red (IR) irradiation at room temperature. Four probe measurements showed the current–voltage (I–V) characteristic of electrical switching during pulsed IR irradiation. The photoresponse reported here for VAG was significantly higher than that reported for carbon nanotube (CNT) samples. Our investigation shows that such a photoresponse arose solely from the bolometric effect, where the conductivity changed with temperature. The resistance magnitude of the VAGs increased ~two fold for each 6 °C increase in temperature. Also, the Thermal Coefficient of Resistance (TCR) in this region was ~11%/K, which is the highest TCR value reported for any carbon nanomaterial.

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Tuning the magneto-optical response of TbPc2 single molecule magnets by the choice of the substrate

Journal of Materials Chemistry C ◽

10.1039/c5tc01520k ◽

2015 ◽

Vol 3 (31) ◽

pp. 8039-8049 ◽

Cited By ~ 16

Author(s):

Peter Robaschik ◽

Michael Fronk ◽

Marius Toader ◽

Svetlana Klyatskaya ◽

Fabian Ganss ◽

...

Keyword(s):

Thin Films ◽

Single Molecule ◽

Room Temperature ◽

Optical Response ◽

Single Molecule Magnets ◽

Kerr Rotation

Magneto-optical Kerr rotation of thin films of TbPc2 single molecule magnets can be tuned at room temperature within almost two orders of magnitude by the choice of the substrate.

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Piezoelectric power generation of vertically aligned lead-free (K,Na)NbO3 nanorod arrays

RSC Advances ◽

10.1039/c4ra02921f ◽

2014 ◽

Vol 4 (56) ◽

pp. 29799-29805 ◽

Cited By ~ 38

Author(s):

Pil Gu Kang ◽

Byung Kil Yun ◽

Kil Dong Sung ◽

Tae Kwon Lee ◽

Minbaek Lee ◽

...

Keyword(s):

Power Generation ◽

Elevated Temperature ◽

Output Power ◽

Room Temperature ◽

Lead Free ◽

Nanorod Arrays ◽

High Output Power ◽

Vertically Aligned ◽

High Output

We demonstrate the potential of eco-friendly nanogenerators based on (K,Na)NbO3 nanorod arrays for high-output power generation at room temperature and elevated temperature.

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Stable Fe nanomagnets encapsulated inside vertically-aligned carbon nanotubes

Physical Chemistry Chemical Physics ◽

10.1039/c7cp05181f ◽

2017 ◽

Vol 19 (47) ◽

pp. 32079-32085

Author(s):

Federica Bondino ◽

Elena Magnano ◽

Regina Ciancio ◽

Carla Castellarin Cudia ◽

Alessandro Barla ◽

...

Keyword(s):

Carbon Nanotubes ◽

Metal Nanoparticles ◽

High Stability ◽

Room Temperature ◽

P Element ◽

Vertically Aligned Carbon Nanotubes ◽

Iron Metal ◽

Aligned Carbon Nanotubes ◽

Magnetic Remanence ◽

Vertically Aligned

Element-specific and surface-sensitive measurements provide evidence of magnetic remanence up to room temperature, low coercivity and high stability of 5–10 nm iron metal nanoparticles encapsulated inside the tip of vertically-aligned mm-long carbon nanotubes.

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Vertically Aligned Mn-doped Fe3O4 Nanowire Arrays: Magnetic Properties and Gas Sensing at Room Temperature

MRS Proceedings ◽

10.1557/proc-1032-i14-40 ◽

2007 ◽

Vol 1032 ◽

Cited By ~ 4

Author(s):

Seon Oh Hwang ◽

Chang Hyun Kim ◽

Yoon Myung ◽

Seong-Hun Park ◽

Jeunghee Park ◽

...

Keyword(s):

Room Temperature ◽

Humidity Sensor ◽

Gas Sensing ◽

Magnetic Circular Dichroism ◽

Nanowire Arrays ◽

Triatomic Molecules ◽

Tetrahedral Sites ◽

Highly Sensitive ◽

Vertically Aligned ◽

Mn Doped

AbstractVertically-aligned Mn (10%)-doped Fe3O4 (Fe2.7Mn0.3O4) nanowire arrays were produced by the reduction/substitution of pre-grown Fe2O3 nanowires. These nanowires were ferromagnetic with a Verwey temperature of 129 K. X-ray magnetic circular dichroism measurements revealed that the Mn2+ ions preferentially occupy the tetrahedral sites, substituting for the Fe3+ ions. We observed that the Mn substitution decreases the magnetization, but increases the electrical conductivity. We developed highly sensitive gas sensors using these nanowire arrays, operating at room temperature, whose sensitivity showed a correlation with their bond strength of diatomic/triatomic molecules. Based on the fact that the sensitivity was highest toward water vapor, an excellent-performance humidity sensor was fabricated.

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