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(a) Atomic force microscope (AFM) image of the 2H-TaSe 2 sample in a 40 × 40 µm region and (b) corresponding height.
Source publication
A novel 2H-phase transition metal dichalcogenide (TMD)–tantalum selenide (TaSe2) with metallic bandgap structure is a potential photoelectric material. A band structure simulation of TaSe2 via ab initio method indicated its metallic property. An effective multilayered TaSe2 saturable absorber (SA) was fabricated using liquid-phase exfoliation and o...
Contexts in source publication
Context 1
... TaSe 2 nanosheets were observed using AFM to investigate the morphology and layer character. The image area (40 µm × 40 µm) is illustrated in Figure 3a. A homodisperse solution was successfully fabricated. ...
Context 2
... homodisperse solution was successfully fabricated. The corresponding cross-section analysis is shown in Figure 3b. The green dotted line denotes the average height, which showed that the thickness of the 2H-TaSe2 sample is approximately 3-5 nm; thus, the fabricated sample is a 4-7-layered structure (single-layered TaSe 2 shows a thickness of around 0.75 nm [24,25]). ...
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Citations
We experimentally demonstrate a harmonically mode-locked erbium (Er)-doped fiber laser using a V2AlC-based saturable absorber (SA) at the 1.55 μm wavelength region. The prepared SA was fabricated using a side-polished fiber with V2AlC MAXphase nanoparticles via liquid-phase exfoliation (LPE). The derived saturation intensity and modulation depth of the V2AlC-based SA were approximately 63 MW/cm2 and 18%, respectively. The repetition rate was tuned from 14.98 MHz to 1.3 GHz (86th harmonic) by adjusting the pump power. The 86th harmonic mode-locked pulses at approximately 1.3 GHz repetition rate were generated with a temporal width and supermode suppression ratio of approximately 863 fs and 30 dB, respectively. These results demonstrate the application of the V2AlC MAX phase in giga-hertz frequency ultrafast fiber lasers.
Few layered transition metal dichalcogenides (TMDCs) are widely used in electrochemical systems due to their unique optical and electronic properties including applications over a large area. Despite the widespread use of 2D layered materials as active components of photoanode, electrochemical conversion studies of few‐layered Tantalum diselenide (TaSe2) are still negligible. In view of this, the TaSe2 nanocrystals (NCs) are successfully synthesized by using the facile liquid‐phase exfoliation (LPE) approach. Different physiochemical characterization confirms the inherent physical and optical properties of TaSe2 NCs. The flexible self‐powered photoelectrochemical (PEC) type photodetector based on TaSe2 NCs achieves the highest photocurrent density (Pph) of 20.8 µA cm⁻² and photoresponsivity (Rph) of 0.208 mA W⁻¹ in 0.5 m KOH. TaSe2 NCs demonstrate the excellent self‐driven ability and also unveil decent response under applied bias potential in different concentration of KOH electrolyte. Moreover, the electrode shows excellent ON/OFF switching stability up to 1000 s even after the 1 month of storage in the air. Importantly, the photodetector retains the Pph of 15.8 µA cm⁻² after 95 bending cycles of 120° angle, displaying the great flexibility of TaSe2 NCs. This work demonstrates the potential of TaSe2 NCs for their extended application in PEC‐type devices and flexible electronics.
