Products > Sample Preparation System for SEM/TEM

Sample Preparation System for SEM/TEM
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Outline and Features

Fixing of nanomaterials on a substrate using an electro-spray

Sample Preparation System for SEM/TEM

Fixing of nanomaterilas on a substrate without aggregation
Easy to make observation substrate for SEM/TEM

PDS-P

Appearance of the system(CLICK: Zoom In/Out)Nanomaterials is preferable to treat as nanosuspension, which is dispersed in poor solvent, because nanomaterials is hard to handle and change aggregation easily.

It is important for fundamental research and application development of nanomaterials to investigate a size, a form and aggregation degree of respective nanomaterial in nanosuspension.



Scanning electron microscope (SEM) and transmission electron microscope (TEM) is suitable for nanomaterilas observation. However, it is hard to observe respective nanomaterial due to the aggregation in the vaporized process of solvent.



SEM/TEM Sample Preparation System PDS-P series

“SEM/TEM Sample Preparation System PDS-P series” is solved these problems by using electro-spray of nanosuspension. The system is possible to fix nanomaterials on a substrate simply, nanomaterials observation of SEM and TEM becomes to be easy.

Applications

Experimental examples of nanosuspension in water

Conventional normal paint of nanosuspension is formed aggregation on a substrate.
Using the system, respective nanomaterial can be separated spatially and observed clearly due to homogeneous fixation of nanomaterials on a substrate by using an electro-spray.

In the left figure of examples (1) (2), the aggregation is formed by normal paint. However, the system is realized homogeneous fixing of nanomaterials on a substrate like right figure.

(1)Diamond nanomaterials in water

(1)Diamond nanomaterials in water(CLICK: Zoom In/Out)


(2)Gold nanoparticles in water

(2)Gold nanoparticles in water(CLICK: Zoom In/Out)

Features

Feature(1)
Fixing of single nanomaterial on a substrate without aggregation
The system is possible to make fine observation substrate without aggregation, if it is used at the concentration, which single or non nanomaterial is contained in single droplet.
Feature(2)
Adaptation of disposable nozzle
Since top of a nozzle contacted sample solution is disposable, washing inside nozzle in a time-consuming is unnecessary.
Feature(3)
Treatable up to 8 micro-litter, and applicable to organic solvents
The system, which is applicable to fine spray consist of small droplet, is treatable up to 8 micro-litter.

Basic principle of
particle deposition of nanomaterials without aggregation

Basic principle of particle deposition of nanomaterials without aggregation
Homogeneous fixing nanomaterials on a substrate is required in the manufacturing process using nanomaterials and in the case of nanomaterials observation by SEM/TEM.

Particle deposition technology is solved these problems by applying an electro-spray.




Principle

1.
Applying voltage between nanosuspension into a nozzle and a substrate, the liquid surface at the tip of the nozzle is changed as cone shape by Coulomb force, and thin jet is form at the top of the cone shape by the reason that the Coulomb force is bigger than surface tension of the liquid.
2.
The jet divides many small droplets due to repulsive force of homopolar electric charge on the jet surface.
3.
The solvent of droplets is vaporized, then charged single nanomaterial makes a flight in the atmosphere along an electric line bound for a substrate.
4.
Nanomaterials is fixed on a substrate so that the flying single nanomaterial avoids previous reached nanomaterilal due to repulsive electrostatic force.



Permittivity of solvents

Bigger number of permittivity is better in the view of fine electro-spray formation. Permittivity of sample solution determines by kinds and concentration of solvent and involved nanomaterials.


[Reference] Permittivity of solvents
water(80) dimethylsulfoxide(47.0) toluene(2.4)
ethanol(20.7) acetic acid(6.2) carbon
tetrachloride(2.2)
methanol(32.6) 1-butanol(18.0) silicone oil(2.2)
isopropanol(18) 1-propanol(20.0) hexane(2.3)
acetone(24.3) acetic ether(6.0)  
dimethylformamide(38) tetrahydrofuran(7.5)  
nitrobenzene(34.8) diethyl ether(4.3)