This product contains GeS mono- and few-layer thick flakes in isopropanol solution. GeS 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 GeS crystals) is highly crystalline, ultrasonic treatment to delaminate GeS layers yields highly crystalline GeSe mono- and few-layers suspended in isopropanol solution. The crystallinity of GeSe 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 GeS flakes deposited onto different substrates range from ~10nm - ~10 um while thickness range from 1L to 10s of layers.
Solution type: By default 2Dsemiconductors USA will provide GeS 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.
Properties of GeS solutions
Germanium sulfide (GeS) XRD characterization
SEM images taken from Germanium sulfide crystals
Germanium sulfide Raman spectroscopy data at different polarization angles (showing angular dependence)
Photoluminescence data collected from GeS crystals (magenta bulk GeS, black 3L GeS)
Frequently asked questions
Q1: Are these solutions good for catalytic measurements?
A: Yes, our 2D solutions are commonly used by catalysis community
Q2: What is the volume of the solution?
A: Each order can either contain 2mL of supersaturated monolayer solution (~200mg/L) or dense 20mL solutions (~20mg/L). We recommend using 2mL solutions as this will cut down the shipping charges and shipping times.
Q3: Are these 2D solutions consist of 100% monolayers?
A: This will depend on your requirements. We can design monolayer, few-layer, multi-layer, and even bulk layered solutions. Please identify what kind of solution (material type) you prefer to use during check out.
Q4: How about the solution types?
A: This will also depend on your application. We have capability to accommodate IPA, H2O, DMF, NMP, and many others. Just let us know what you have in mind.