WTe2 Solution

This product contains WTe2 flakes (type-II Weyl semimetal) in dispersed isopropanol solution. WTe2 crystals has been synthesized synthetically at 99.9995% purity and they have been dispersed into isopropanol (electronic grade chemical at 99.9999% purity) by ultrasonic treatment. Since the starting material (synthetic WTe2 crystals) is highly crystalline, ultrasonic treatment to delaminate WTe2 layers yields highly crystalline WTe2 mono- and few-layers suspended in isopropanol solution. The crystallinity of WTe2 nanomaterial has been confirmed through electron energy dispersive spectroscopy (EDAX), Raman spectroscopy (FWHM<5 cm-1), and scanning electron microscopy (SEM) measurements. Lateral sizes of WTe2 flakes deposited onto different substrates range from ~10nm - ~10 um while thickness range from 1L to thicker sheets.

Solution type: By default 2Dsemiconductors USA will provide WTe2 sheets suspended in isopropanol owing to good dispersion, stability, and high performance. However, if your research requires other solvents, please contact us for more details and schedule for the product delivery.

Solution concentration:  To reduce shipping costs, easy customs agreement / border check-in processes, we ship supersaturated 2D solutions (~80-120 mg/L depending on the type of 2D layers). However, supersaturated solutions can be diluted to produce ~250-500mL of solution to deposit 2D layers onto desired substrates through simple and cost-effective spin-casting process. 

Typical characteristics of WTe2 crystals from 2Dsemiconductors USA (2D solution is created from WTe2 crystals)

Crystal size	~1 cm
Material properties	Type II Weyl semimetal
Crystal structure	Orthorombic phase (P configuration)
Unit cell parameters	a=0.351 nm, b=0.628 nm, c=1.412 nm; α=β=γ=90°
Growth method	[Default] Flux zone (no halide contamination) defect free [Optional CVT]: Contains Br2, Cl2, TeCl4, and other halides
Purity	99.9999% confirmed

 

 Publications

https://www.nature.com/articles/s41598-020-66664-9

Mode-locked thulium/holmium co-doped fiber laser using WTe2-covered tapered fiber
Optik Volume 245, November 2021, 167723