SKU: 80150399221

Thin Layer WS2 Nano Powder

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Description

Thin Layer WS2 Nano PowderProduct Name Name: thin Layer WS2 Nano Powder Product Overview Tungsten disulfide (WS2) is a type of transition metal sulfide (TMDC) with a graphene like layered structure, where the layers are stacked together by weak van der Waals forces. Single layer WS2 is composed of three layers of atoms, with the atomic planes of W and S arranged in a hexagonal array. The W atoms are sandwiched between the two layers of S atoms, forming an S W S atomic layer

Product Name

Name: thin Layer WS2 Nano Powder


Product Overview

 

Tungsten disulfide (WS2) is a type of transition metal sulfide (TMDC) with a graphene like layered structure, where the layers are stacked together by weak van der Waals forces. Single layer WS2 is composed of three layers of atoms, with the atomic planes of W and S arranged in a hexagonal array. The W atoms are sandwiched between the two layers of S atoms, forming an S-W-S atomic layer structure with a "sandwich" structure. Multi layer or block WS2 is composed of single layers stacked together. Depending on the stacking method of the single layers, WS2 has three crystal structures: 1T, 2H, and 3R.

The synthesis methods of WS2 are mainly divided into two categories: "top-down" stripping method and "bottom-up" method. The "top-down" exfoliation method includes micro mechanical exfoliation, liquid-phase exfoliation, and lithium-ion intercalation, mainly using physical means to exfoliate the bulk WS2 into a single-layer or few layer layered structure. The "bottom-up" method includes chemical vapor deposition, hydrothermal method, and high-temperature thermal decomposition method, mainly using chemical means to grow atoms and molecules into nanoscale thin films and granular WS2 under certain environmental conditions.

The WS2 provided by Xianfeng is prepared by lithium intercalation method, using n-butyl lithium as intercalation agent to insert lithium ions into the interlayer of WS2, forming LixWS2 intercalation compound. The intercalation compound reacts violently with solvent water to generate a large amount of H2, thereby increasing the interlayer spacing of WS2 and weakening the van der Waals forces between layers. After ultrasonic treatment, thin and few layer WS2 dispersions are obtained. The WS2 nanosheets obtained by lithium intercalation method have a 1T-2H phase hybrid structure. According to XPS calculation, the fitting ratio of 1T phase is about 60% (the values may vary between different batches).


Technical Parameter

 

Flake Size: 20-500 nm

Thickness: 1-5 nm

 

Product Features

 

1. Good dispersibility: Dispersions of different types of solvents are available (water, ethanol, isopropanol), as well as WS2 powder obtained by freeze-drying the dispersion.

2. Multiple active sites: It has good catalytic performance and a large specific surface area that can be used to load other catalysts to improve catalytic efficiency.

3. Excellent light absorption ability: It has strong absorption ability for near-infrared light and can be used for photocatalytic water splitting to produce hydrogen, organic pollutant degradation, etc.

4. Adjustable size and thickness: Different diameters and thicknesses of nanosheets can be customized to meet the experimental needs of different researchers.


Application Fields

 

1. Electronic and optoelectronic devices: The band structure is closely related to the thickness of the material layers, and the adjustability of WS2 thickness can give it different optoelectronic properties. Single layer WS2 has the advantages of high electron mobility, large on/off current ratio, and current carrying capacity, and can be used in the manufacturing of electronic devices such as transistors.

2. Electrochemical biosensors: WS2 exhibits excellent electrochemical sensing performance due to its large specific surface area, good electron mobility, and high electron density of states,

It can be used to detect biomolecules such as DNA and glucose, and has excellent selectivity for some organic molecules such as formaldehyde, ethanol, and benzene.

3. Biomedical: WS2 has good light absorption ability in the near-infrared region, which can convert light energy into heat energy. The high temperature generated can cause tumor cell apoptosis, and it also has good biocompatibility, making it an excellent photothermal conversion material.

4. Energy storage: WS2, due to its unique layered structure, can provide certain adsorption sites for energy storage; Meanwhile, WS2 has good stability and can be reused for cyclic charging and discharging, and is widely used in fields such as fuel cells, supercapacitors, and lithium batteries.

5. Catalyst: WS2, due to its light weight and large specific surface area, can be used as a photocatalyst. After visible light irradiation, WS2 can absorb photons, undergo electron transitions to form electron hole pairs, and react with water to generate hydroxyl radicals with high reactivity and strong oxidizing properties, which degrade organic matter into small molecules and inorganic ions.


INSTRUCTION FOR USE

Attention: When taking TEM images, it is necessary to use micro grids (with the thinnest possible thickness) to prepare samples, which makes it easy to observe their layered structure; Dispersed liquid is prone to oxidation when exposed to air, and its color will fade over time. When storing, inert gas can be introduced to remove oxygen and extend the use time; The dispersion liquid will contain lithium hydroxide, which acts as a stabilizer to aid dispersion and can be removed by centrifugal washing; The powder is obtained by freeze-drying the dispersion, and its dispersibility is slightly worse than that of the original solution.


Related Information

Please e-mail for the detailed characterization data.

E-mail:[email protected]

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SKU: 80150399221

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Dr VickersBey JD
Lowell, US
★★★★★ 5
Post Traumatic Slave Syndrome
Format: Hardcover
Very well done book that does not make Black People feel angry nor White People guilty but from a gentle and skillful psychological point of view the book will "have you considered the impact of this or that upon both races as the result of Slavery in America?" A folk-like homespun way of tell these truths that masks the clinical questions that all trained psychologist asked..."and how would (does) that make you feel for all of us who ever sat on a couch?" The book made me consider the psychological impact of daily slave life with a WOW again and again as I never thought of the situations the book made me consider. The shared dehumanization of both whites and blacks due to the slave experience which goes a long way towards explaining to me why we as a country cannot truly discuss slavery's impact today. I found it self-healing and very necessary for all, both black and white, but especially for the victims of the African Holocaust my terminology not hers. I thought Dr. Leary PhD, did an excellent job and a high school or even a 6 grader could read the material without difficulty.
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Reviewed in the United States on November 18, 2010
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Heather
Alexandria, US
★★★★★ 5
Healing & Understanding
Format: Paperback
We are living in a slave master's land (was the Indians..). Hundreds of years of slavery, mental torture and degradation and then "freed." No therapy. No understanding, not even patience. To listen to Dr DeGruy's youtube videos was so enlightening to me. Sorrow, but understanding and then JOY. I didn't understand the anger, towards myself or others. Now, I can see where so much pain has come from. I can show compassion and love towards myself and others. Whatever programming I had, has been deleted--destroyed. I look back with pride, hurt, and know that I, myself, can heal. What a blessing this woman has brought us! Thank you Dr. Joy DeGruy!
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Reviewed in the United States on November 3, 2024
A
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Athena
Omaha, US
★★★★★ 5
Aged wisdom and knowledge
Format: Paperback
Mental health and history goes hand and hand
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Reviewed in the United States on June 22, 2025
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A.
New York, US
★★★★★ 4
Why do black people . . .
Format: Hardcover
I purchased this book because I had many questions I wanted answered. Most of them were questions of "Why?". My biggest question was why we as black people have so many unhealthy habits in how we treat each other. As a young African American male who was raised by his mother in a predominantly white suburban area, I wanted to know why, when I encountered other black youth in more urban areas, they would tell me I "talk white." What is "talking white?" Basically, talking white means I was talking like I have an education. Why do so many members of the black community (those without an education) reject me for valuing education? Why is it that when one black person fidns a way out of the ghetto, it seems the whole neighborhood, church included, condems that person for leaving "his/her people" and wanting to live in the suburbs with the whites? Why don't we support one-another in this society that has always held us from achieving our full potential? I wanted to learn why we seem to have no clue of who we are, and so many of us, young and old, strive to "prove" we are "black enough." So talking a certain way makes us black? Or is it eating certain foods that makes us "black"? Listening to only certain kinds of music? We lack a firm sense of cultural identity. We take rebellious pride in being at the bottom, and equate success with "whiteness." We denounce the achievements of any black person and ostracize him from the community. We work to pressure our own to stay at the bottom. In this very interesting book, the author, Dr. Joy Degruy Leary, proposes a number of explanations for why the African American community has developed these and other unhealthy cultural habits. Leary examines this very real "crabs in the barrel" mentality, as well as many other self-destructive habits which plague the black community. Leary establishes a diagnoses, and calls it Post-Traumatic Slave Syndrome. Leary presents a very strong argument that the behaviors are all symptoms that have been passed down through the generations of African American people from the dawn of the trans-atlantic slave trade to today. Leary uses her own observations to support her theory of Post-Traumatic Slave Syndrome. This book is a very thoughtful read. The reason I give this work only four stars is because I truly feel that Leary's argument would have been much more affirmed and effective if she had included a visual timeline to help the reader to better understand the timeframes and chain of events in history discussed in the book. The argument also would have been more effective if the author spent more time on each point. At times it seems she's just getting started before summarizing all that was just said and moving on. Scholarly sources are cited and research is used, but the book does not explore any one study or statistic in great depth. It is a fast read.
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Reviewed in the United States on September 16, 2012
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ez2laf
Whiting, US
★★★★★ 5
America's Biggest Lie
African Americans have been brutalized beyond imagination. Then told that they were the ones that were less than human. It boggles the mind. The whites beat, burned, skinned, lynched, mutilated and murdered African Americans at will. And these same whites believe (to this day) that this is their god given right. Even worst was the emotional and intellectual scars left from the lies that were told. If I didn't see the consequence of this everyday, I would think someone was lying to me: Some kind of Cosmic joke. The white criminals are the heroes and the African victims are the villains. This cannot actually be real. But it is. Whites stripped the Africans of their names, religions, dignity, culture and their humanity. Then called them less than human. This slight of hand is beyond comprehension. The funniest part is when I hear Whites yell to blacks "go back to Africa." This is tantamount to kidnapping someone, tying them up, putting them in your basement then yelling at them to get out of your house. Insane. This has been going on for 400 years. Wow. And America thinks it the moral leader of the free world. I have to pinch myself. This has to be a dream.... or a nightmare. The book opened my eyes.
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Reviewed in the United States on August 18, 2017

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