Nanomaterials Synthesis - Science topic

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what is the procedure of synthesis of nanomaterial -Bottom-up -Chemical Etching?

Advantage and disadvantagesAdvantages of this technique?

Why is MXene morphology always in nanosheets? Can it be spherical, Core-shell, cubic or needle-shaped?

is it just used distilled water to get graphene oxide solution from graphene oxide powder ?If yes how the procedure?

Some papers quoted that synthesized zinc sulfate nano particles having the solubility of 100%. As per my little knowledge of nano technology, once the particle soluble, it will not sustain its size as in the nano meter range and converted to angstrom range. And so called particle not called as nano particle. So kindly clarify my query?

Most of the research using trisodium citrate to reduce Ag ion and its act as stabilizer. How if we replace trisodium citrate to sodium citrate monobacis? How is the chemical equation be?

Some was used both trisodium citrate and sodium borohydride in synthesize Ag nanoparticles. What if we used both trisodium citrate and sodium borohydride?Will both of the reducing agent take part in reaction to form Ag nanoparticles?How is the chemical equation be?

I picked up some 1.5mm OD theta (2 chamber) borosilicate pipettes and would like to pull them to a point, the exact size of which is not critical. I have a Sutter P-2000 puller (CO2 laser) to do the job, but I can't seem to find parameters anywhere describing how someone has pulled a theta glass pipette. Anyone have success doing this?

Hi! Can anyone of you recommend a company that synthesize good nanoparticles? Ideally, if we could by already loaded nanoparticles with an agent of our interest.

Will appreciate all of your suggestions.

I had used an AAO template for the formation of the organic-semiconductor nano-wires by filling the pores of AAO with the molten state semiconductor material. After the formation of organic-semiconductor nano-wires I need to etch-out AAO template parts.

So please give me the suitable etching solution and steps of etching process.

Can anyone give some papers related to this?

For calculating the crystallite size of a catalyst, we use Scherrer equation. In which FWHM is required. Whether, crystallite size is depends on maximum intensity peak or average of crystallite size of main characteristic peaks?

I'm trying to synthesize bulk hBN powder from boric acid and urea precursors in a tube furnace. My goal is to get 100s (or at least 10s) of milligrams of hBN from each synthesis that I can use in catalytic reactions. I have a tube furnace that can go up to 1200C. Based off many references, I know that I need a high molar ratio of urea: boric acid, so I've been doing 30:1 (though I've also tried lower). I add ~150 mg boric acid and ~4.5g urea to a beaker with 20 mL DI H2O + 20 mL methanol (based on: ), then leave it in a 65C oven overnight to evaporate and recrystallize. In the morning, I grind it to a fine powder using a mortar and pestle, then load the powder into a ceramic boat with a lid (see photo), and load that into the quartz tube. I attach the gas line (I've used both Argon and N2) and I run the gas for 30 min, then turn on the instrument. I heat up at 5C/min until 950C or 1100C. The tube turns white (and sometimes a bit yellow) with urea (decomposition). Both have yielded charred, burnt material, not white hBN powder, or only a tiny amount of white, flaky powder amidst the char (see photo). I've talked to a couple of collaborators and read a number of papers and can't find anyone who has experienced this problem, though no one has tried this synthesis on my lab's exact tube furnace.

Does anyone have advice on how to eliminate these problems and move forward? Any advice would be much appreciated!

Some potential questions

-is oxygen getting into the reaction and causing it to char?

-should the ceramic boat's lid be removed? Is that a problem?

-should I switch to a rounded ceramic crucible, with or without a lid? (though that's harder to put in a round tube without spilling)

-should I change my temperature or ramp rate?

Dear Researchers, I would like to open this discussion, I think it could be interesting and we participants can learn much from each other :

Is it well known that the so called reduced-size effects in Material Science can originate different behaviors in different properties of a given material (this is also known as "Nanomaterials", or "Nanostructured Materials")

Hence the question:

All Nanomaterials have higher Electric Conductivity than its bulk-size respective part ? The logic is that the DOS (Density of States) becomes (theoretically) infinite for some values of Energy in the material (the typical graph of E vs. g(E) for 0D Materials, which distributes this Energy discrete values in peaks, speaking of the shape).

So, this makes me think that for all solid materials; sigma increases (for this values of Energies) when the dimensions of the material decrease.

Regards !:)

The coating that I get is not good adhered on a glass substrate. The reduced graphene oxide had dried using freezer (-73 degree celsius). I'm using DMF solvent for reduced graphene oxide solution. Can anyone give me the suggestion for the good coating of reduced graphene oxide on a glass substrate? 

I have synthesized NiO nano particle. And they shown change in properties when we goes from bulk to nano regime. In bulk regime shown transition metal oxide but in nano regime shown semiconductor. Why this properties will be changed? I want to know the exact reason. Please explain it in details.

Phytochemical nano-synthesis involves the use of plant's extract as a reducing entity. However, as simple and cheap as this may seem, the technique has faced many challenges overtime. So what are the major challenges of phytochemical nanomaterials synthesis. The options include but not limited to

There are different nanostructures of silicon like nanotubes, QDs and silicene. I need to know what are the 'green' or other effective methods for preparing them..please share the procedures of following methods

1. Hydrothermal method

2. Spray pyrolysis

3. Laser and combustion methods

I want to dope Copper metal in to bismuth vanadate (BiVO4) for 2at%. The compound that I am expecting is Bi V0.98 Cu0.02 O4. Could someone explain how to calculate the amount of precursors?

Precursors are Bismuth nitrate pentahydrate and ammonia meta vanadate for Bi and V. for dopant Copper nitrate trihydrade.

Hello we all know the electronegativity scale and concept of elements in the periodic table

However when it comes to whole materials such as polymers, nanomaterials and etc

How can we understand theoretically if the synthesized material is highly or poorly electronegative ??

Most of the reported mixed metal oxides are prepared from their precursor materials. I want to prepare mixed metal oxides from already prepared metal oxide materials. For example, CaO and Fe2O3 are available commercially, I want to combine them together via a suitable chemical method like making a core-shell structure, or CaO coating on Fe2O3 surface. Please give me an idea on how to make mixed metal oxides from prepared metal oxide and send me any reference articles.

We want to prepare graphene or reduced graphene oxide. I am looking for a technique that can produce graphene directly onto glass substrates. Can anyone let me know which method is best. Any references?

In order to improve the intimate contact of micro size silver flake in a solvent based printable polymer conductor I am looking for a method to precipitate nAg powder (from Ag salts) on an already designed micro flaky shape silver material.

Any suggestion?

For the preparation of selenium nanoparticles mostly selenious acid is used however if someone try to prepare it from selenium dioxide what will be the proposed procedure or mechanism?? Is it possible to make selenious acid from selenium dioxide in ordinary chemistry lab?

There are hundreds of research articles published on the green synthesis of nanoparticles of various metals and metal oxides nanoparticles using plant extract (where mostly the extract of leaves are used) and they reported that plant extract is in rich of phytochemicals which act as reducing, stabilizing/capping agent for the synthesis of Nanoparticles but still its not cleared that exactly which phytochemical or which class of phytochemicals is responsible for reducing and which for stabilizing/capping? And also if they are used separately after isolated would they gave the same result or each class depend on one another??

I need references articles that explain the drawings for the following materials, which illustrate the diagram between DR UV-Vis spectrums of the following materials blank sample as expressed in Kubleka-Munk function versus

the measured wavelength and the materials are ZnO, CuO, Fe2O3, and Co3O4.

Hi,

I am trying to exfoliate single and few-layer of MoS2 from the bulk crystal using the scotch tape method. But I was not able to get very thin MoS2 nanosheets in this method. Graphene worked very well but MoS2 did not. Any suggestions on it?

Thanks!

Mxene nanomaterials have great potential now a days. However, the preparation of Mxene not easier like graphene oxide and graphitic carbon nitride. So kindly suggest me a symple method to synthesis Mxene.

I want to Synthesize Molybdenum Disulfide at Nano Scale. Can I use Ethanol Amine or Poly ethylene glycol instead of Oleic Acid? Please brief with the reason.

Sir,

With reference to your paper "Strain-driven electronic band structure modulation of si nanowires" I want to ask

1. When the uniaxial lattice strain is given by changing the unit cell size along the nanowire growth direction. what happens to the atoms inside the unit cell. They are stretched (i.e. their bond length and bond angel  changes)?

2. When the wave function of conduction band contains contribution from 3d-orbitals, why does the energy level decrease and what is bonding type functions?

I cannot find any noticeable references!

Between Iron oxide and Graphene which type of interaction gives the stability of the iron oxide into the nanohybrid?

I am trying to produce graphite oxide using staudenmaier method, I have been using sodium chlorate in place of potassium chlorate. Is this a problem?

Some researchers have been reported DF10, Acetylacetone and PVP as surfactants, but I need more information for preventing from agglomeration of particles during co-precipitation synthesis of Lanthanum Strontium Cobalt Ferrite(LSCF) compounds

Hi, I'm trying a procedure to synthesis nano ZIF-90 in water for specific application, but there is some problem. pxrd pattern for as-synthesized MOF is not completely compatible with charactristic XRD pattern of ZIF-90, in terms of tetha. on the other side, as article indicated, i choose 1 to 40 ratio of zinc acetate to 2-imidazole carboxaldehyde to obtain particles with the scale of 100 nm, but led to really low yield, there is not another way to reach nanosize ZIF-90? I appreciate if anyone has the same experience and could help me.

Is there any matematerial which can reflect right handed circular polarization into Left handed circular polarization or vice versa of the EM waves operating in ultra-wide band?

I want to Synthesize Sn doped Nanostrucutres with Iron and Sn Chlorides by Co-precipitation method... 

I was previously working in WS2 nanopowder synthesis by using a microwave plasma process. I am interested in exploring WS2 thin films from RF sputtering. We have a multi-source PVD system, in which we can deposit WS2 thin films.

My main concern is that the sulphur from the WS2 target should not affect the other sources, such as thermal and electron beam evaporation.

I am curious to know whether it is advisable to do WS2 sputtering in such a multi-source PVD system? Kindly give your suggestions regarding this problem.

Is it possible to synthesize carbides by solution-based fast-synthesis? such as Solution combustion method.

We've got some carbon quantum dots in a mixture of H2SO4 and HNO3. Can anyone help me out with any possible ways to separate these quantum dots from acid without adding any more ions to the solution?

Hi everyone,

At this moment, I'm working with Au-CeO2 nanoparticles, and I need to dissolve them with a solvent whose evaporation temperature isn't higher than water temperature evaporation.

Thank you so much!

Most of the literature reports that I came across are vague, especially the separation process.

So, I am looking for the tried and true protocols which can yield <10 nm MoS2 quantum dots.

Any relevant reading suggestions are also much appreciated. Thanks.

Hello,

I want to prepare g-C3N4 nanomaterials. Can you kindly suggest what type of furnace is necessary to prepare them? Is there will be any model number and specific features?

Dear all,

I am trying to fabricate material via a solvothermal method.

I use Teflon lined stainless steel autoclave.

Most of the time in the papers, authors mentioned the volume of the autoclave that they used.

My question is that I should change the volume of autoclave based on the volume of the solvent.

Should I fill the autoclave up to a specific volume of its capacity?

Hello.

How can I synthesis green emission carbon dots with microwave from glucose?

and How can I synthesis green emission carbon dots with microwave from citric acid and Urea?

I am presently working on solid solution of BaCeO3-BaZrO3.

I prepared powders of BaCe0.5Zr0.3Y0.2O3 composition by sol-gel process and got single phase perovskite. During sintering at 1450 C for holding time of 5h, pellet getting cracked. Please give some suggestion to get dense pellets

I synthesized oleic acid capped SnO2 nanoparticle solution by hydrothermal synthesis method.

The solution in the three vials in the picture is a solution synthesized in the equal amount of reactant and same temperature.

Left - by three neck flask

Middle – by autoclave

Right – by three neck flask / different pressure compared to Left

After the synthesis, I spread them to the hexane at the same concentration and stored in refrigerator.

The solution in the left vial was coagulated like jelly. In the middle solution was murky and the particles sank to the floor, and the solution in the right vial was transparent and well dispersed.

I wonder why the difference in these solution occurred and what kind of characteristics it might have been. (ex, solubility size of nanoparticle, oleic acid dose not stick to nanoparticles, why?)

If you have the same experience or know about this, I'd appreciate it if you could help me.

As all we know, by changing the size of perovskite nanoparticles, we can tuning of band gap would accur, so that according to each band gap we would expect photoluminescence in a certain wavelength. In lead halide perovskites, when we use bromide in the site of halogens, the luminescence will be green. In the case of CsPbBr3, we can have blue emission up to green related to size of nanobparticles. Now, if we have large particles that have luminescence, can we expect orange emission from that? (Although I've seen articles which has reported emission from micro size particles.)

I want to use NiCo2O4 as a substrate in 0.5 M H2SO4 solution. Just wondering will it be chemically stable in strong acidic solutions? 

We are dealing with the work entitled Synthesis of silver nanoparticle from plant. I have faced problem with particle size analysis by DLS. We got silver nanoparticle size in the micron range not in nano size, Can anyone send me the exact protocol for nanoparticle synthesis from water hyacinth plant?

Silver nanoparticles have been synthesized using glucose but the resulting colloid is dark gray. Are the particles composed of micrometer? Or due to the non-spherical colloids is it this color?

I get very transparent yellow colloids using other methods (for example polyol method or reduction with sodium borohydrate) but it is not possible to separate the nanoparticles from the yellow solution. The resulting powder is not in operation. I need to produce a product that is a powder of silver nanoparticles. Please guide.

What are the most important conferences and symposiums in the field of nanomaterials, advanced materials or microfluidics in the Canada and USA?

FTIR Spectrum result wavelength range of ZNO nanoparticles.

If we are synthesizing silver nanoparticles (AgNPs) together with PVP as stabilizer, there are sure some PVP include in AgNPs and might excess of PVP and silver ion were get rid during washing. When redispersed it again to water, how we to calculate or know the exact Ag concentration. For example, how we know there are how much of AgNPs in 1000 mg/L of PVP capped silver nanoparticles?

Iron oxide nanoparticles show magnetic properties. Are nanozerovalent iron nanoparticles also magnetic in nature?

I am looking for a nanomaterial which is sensitive to phosphate and I can use it as a sensor for phosphorous detection.

Dear respected RG members,

Recently, we tried to prepare Ni doped MgO nanoparticles using co-precipitation method. The XRD pattern of pure MgO-NPs is going well with five peaks (20-80 degree). We encountered unusual peak at around (64 degree) 2theta for 3% doped MgO-NPs. We follow the same procedure of preparing pure MgO. Stiocheiometric amount of magnesium nitrate hexahydrate (0.097 mol) and nickel nitrate hexahydrate (0.003 mol ) were dissolved in 200 ml water and the aqueous solution heated to 70 Celsius. Then, 0.2 mol of NaOH was add to the mixture as fast as possible till the precipitate occur (pH 10 ) and stirred for another 2 hrs at 70 C. The precipitate dried and crushed (using pestle and mortar) and calcined at 500 C for 2 hrs with a heating rate of 10 degree/min.

Our main concerns are:

1- The unknown peak at (64 degree) may come from impurity during grinding using pestle and mortal.

2- Is the incorrect calculation ( nonstoichiometric ) of the main precursor and the reagent cause this issue?

3- The Ni show very high solubility in MgO host lattice without phase separation, so we do not believe that the impurity is related to Ni, NiO or Ni2O3.

Please we are looking for your recommendation and help

I want to solve approximately 50mgr PbI2 in 10ml chloroform.

Is it possible? Does anyone have experienced this?

I don't want to heat my solution up. But if I solve it with raising temperature, then cool it down, does it precipitate?

Hi all,

I am ready to collaborate in writing book chapters in extractive metallurgy, nanomaterials, synthesis of nanomaterials as well as research and writing scientific articles.

please contact me

S. Yousefi

Hello everybody

I measured BET surface area and Electrochemically active surface area (EASA) of synthesized MnO2 nanomaterial. EASA was obtained by using Cyclic voltammetry at different scan rates (considering slope (Cdl) by plotting current (mA) vs. scan rates (mV/s)). the slope was obtained to be 0.0487 mF. Here, the carbon clothes (1 cm2) was used as a substrate for MnO2 nanomaterial, and considered Cs = 0.02 mF/cm2. EASA calculated from Cdl/Cs. The mass loading of the MnO2 on carbon cloth was about 0.00036 g/cm2.

1- First question is that "considering Cs=0.02 mF/cm2 as specific capacitance of an atomically smooth carbon meterials" is correct?

2- Second question is that : The BET surface area of MnO2 was obtained to be 17.5 m2/g. But EASA was obtained to be 0.0487 mF (slope), 2.435 cm2 (from Cdl/Cs), and 0.68 m2/g. Why there is high difference between obtained BET surface area (17.5 m2/g) and EASA (0.68 m2/g). Is there somethings wrong with the EASA result or it is correct?

I will be thankful if you could help me regarding two above questions.

Thank you

Good day all, I am trying to dope iron in MgAl2O4 spinel using solution combustion method. Urea and citric acid are employed as fuels, but in all cases I am getting poor Fe dispersion where Fe appear to form clusters. Please what do I do to improve the dispersion. Thank you.

we may faced problem in removing plant extract from silver nano particles. If we check pharmacological activity as such we may not able to discuss the exact mechanism by which these particles show the activity.

Dear Colleagues,

In recent years, carbon-based nanomaterials, such as graphene, carbon nanotubes, fullerenes, etc., have gained tremendous interest and more and more applications reap their numerous benefits. Lately, carbon nanodots (CNDs) have emerged as a new class of carbon-based nanomaterials, which have "outshined" other carbon-based nanomaterials, as they possess a unique combination of outstanding, enthralling and favorable properties for many applications. They are the sole carbon nanomaterials with inherent photoluminescence whereby multitudinous applications have been developed. They have been utilized as probes for analytical or biological applications, bioimaging agents for live cell and animal imaging purposes, drug carriers, photosensitizers in photodynamic therapy as well as in photocatalysis, solar cells, optronics, etc. The CNDs have come into their own as a standalone research field but their full potential is yet to be unraveled and harnessed. To understand their properties and gain deep knowledge on the subject, concise reviews and state-of-the-art research articles are needed.

In this context, we launched a Special Issue of C—Journal of Carbon Research, “Recent Advances in Carbon Dots” (https://www.mdpi.com/journal/carbon/special_issues/carbon_dots#published) , which is dedicated to the advancement of this novel field. We invite authors to submit original research articles, communications and reviews, related to all advances in the field of CNDs.

Contact me for further details.

List few advantages and shortcomings of the preparation methods of Metal oxides using PLD. Because, as far as I know, the magnetron sputtering can also be used as forming metal oxides precisely. What is the difference between Pulsed Laser deposition and Magnetron Sputtering for the preparation of Metal oxides?

Suggest references.

I have prepared TiO2 nanomaterial in which I got both anatase and rutile phases. I want to calculate the amount of anatase and rutile phases present in that. Please suggest how I can calculate the phases?

I would like to know researchers view on this area,

What are the possible sources?

Plz, let me know references.

Mentioned in article- `Medium viscosity and 91% Deacetylation degree chitosan'. Viscosities are given as range in other internet sources.

I am size selecting the graphene produced in the lab. While performing Raman analysis, I am finding that the larger flakes have a greater ID/ID' than the smaller flakes. Could anyone please explain why this is happening? (Please see the attached image)

I have read that ball milling is a procedure which is usually used for nano material synthesis without the aid of solvents. At the same time, i have found some literature regarding synthesis of 2D materials by ball milling in which they have used ethanol as solvent.

We know different material has different density and acoustic impedance. A particular value needs to be specified to get the actual deposition thickness of a particular material through thickness monitor. I shall be highly obliged if anyone can provide me the value of acoustic impedance that should be set for In2O3 and Er2O3 in electron beam evaporation.

.

Dear all,

I'm performing colloidal syntheses of Si and Ge nano-particles (NPs).

Lately most of my result (XRD, EELS, Raman) are strongly effected by the presence of Nickel in my solution. The Ni come from the thermocouple i've been using.

I'm performing a standard hot injection synthesis protocol with a Schlenck line to work in oxygen-free atmosphere.

At first planning ahead of the problem we started the synthesis with a fretted glass jacket inserted in a 3 neck round bottom flask where to stick the TC in an inert solvent, but this has been troublesome for the accuracy of the temperature reading, given the different heat capacity of the 2 solvents.

Do any of you had a similar problem, how would you prevent the thermocouple to contaminate the synthesis?

Looking forward your answer and do not hesitate to contact me if interested.

Best

Bruno

Dear experts,

I am trying to study the affect of Zinc doped BeO, as far as I know, beryllium oxide have a large band gap about 10 eV, while ZnO have 3.3 eV, both of them crystallize in wurtzite structure.. and there is a large mismatch between Be ionic radius (0.27) and Zn ionic radius (0.6).. Can I force Zn atom to replace the Be atom in the unit cell to produce a doped powder...

Any suggestion will be really helpful...

Best regards...

mohammed

what are the techniques/ways to check and confirm the atomic level doping in materials ?

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