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Key Documents

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Safety Information

808822

Sigma-Aldrich

Tungsten diselenide

Crystal, 99.995%

Synonym(s):

Tungsten (IV) selenide, Tungsten selenide

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About This Item

Linear Formula:
WSe2
CAS Number:
12067-46-8
Molecular Weight:
341.76
MDL number:
MFCD00049703
UNSPSC Code:
26111700
PubChem Substance ID:
329769125
NACRES:
NA.23

Quality Level

100

description

Electrical properties: Semiconductor, p-type

Assay

99.995%

form

crystals

L × W × H

0.5 cm × 0.5 cm × 0.1-0.15 mm, typical size, some variation in dimensions may occur with different batches

primary crystallite size

~10 mm (hexagonal)

SMILES string

[Se]=[W]=[Se]

InChI

1S/2Se.W

InChI key

ROUIDRHELGULJS-UHFFFAOYSA-N

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This Item
M830427606240176
苹果酸 Pharmaceutical Secondary Standard; Certified Reference Material

PHR1273

苹果酸

苹果酸 meets USP/NF testing specifications

M8304

苹果酸

DL-苹果酸 meets analytical specification of FCC, E296, 99-100.5% (alkalimetric)

27606

DL-苹果酸

DL-苹果酸 ReagentPlus®, ≥99%

240176

DL-苹果酸

application(s)

cleaning products
cosmetics
food and beverages
personal care
pharmaceutical (small molecule)

application(s)

pharmaceutical (small molecule)

application(s)

pharmaceutical (small molecule)

application(s)

-

technique(s)

HPLC: suitable, gas chromatography (GC): suitable

technique(s)

-

technique(s)

IR spectroscopy: suitable

technique(s)

-

format

neat

format

-

format

-

format

-

Quality Level

300

Quality Level

200

Quality Level

200

Quality Level

200

grade

certified reference material, pharmaceutical secondary standard

grade

-

grade

-

grade

-

storage temp.

2-30°C

storage temp.

-

storage temp.

-

storage temp.

-

Application

The two dimensional layered inorganic nanomaterials have drawn significant attention recently owing to their thickness dependent physical and chemical properties. They find applications in photocatalysis, phtotovoltaics, gas sensing, lithium ion batteries, field effect transistors, spintronics etc. Transition metal dischalcogenides represent an important class of inorganic 2D materials having the aforementioned applications.[1][2][3]

Preparation Note

Store under nitrogen atmosphere.

Signal Word

Danger

Hazard Statements

H301 + H331,H373,H410

Hazard Classifications

Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - STOT RE 2

Storage Class Code

6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Regulatory Information

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Certificates of Analysis (COA)

Lot/Batch Number
MKCT7333
MKCT1735
MKCN8561
MKCL6353
MKBX7562V

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Nanocomposite strain sensors, particularly those consisting of polymer-graphene composites, are increasingly common and are of great interest in the area of wearable sensors. In such sensors, application of strain yields an increase in resistance due to the effect of deformation
Exploration of Nanostructured Functional Materials Based on Hybridization of Inorganic 2D Nanosheets.
Gunjakar JL, et al.
The Journal of Physical Chemistry C, 118, 3847-3863 (2014)
The super materials that could trump graphene.
Elizabeth Gibney
Nature, 522(7556), 274-276 (2015-06-19)
Sheneve Z Butler et al.
ACS nano, 7(4), 2898-2926 (2013-03-08)
Graphene's success has shown that it is possible to create stable, single and few-atom-thick layers of van der Waals materials, and also that these materials can exhibit fascinating and technologically useful properties. Here we review the state-of-the-art of 2D materials

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