Preparation of Macroporous Epitaxial Quartz Films on Silicon by Chemical Solution Deposition

The overall goal of this synthesis is to prepare thin epit taxal films of quartz on silicon substrates, which is important to achieve a nanoscale bottom-up integration of two relevant materials for the information and sensing technologies. The main motivation of this work was to achieve a Pentax integration of two technologically relevant materials. This is the first time that direct integration of Quas on silicone was achieved using soft chemistry.

This methodology is highly versatile since it's produced meso, porous, and macroporous who are thin films, which is very advantages for sensing a Catholic and catalytic applications. The Pazo electrical properties of these thin core films are appealing for making electromechanical sensor devices as high resonance frequencies are expected for themes with things is not exceeding one micron First weigh 1.68 grams of subtle trimethyl ammonium bromide, 48.13 milliliters of ethanol. That is 37.90 grams and three milliliters of 35%hydrochloric acid.

That is 3.67 grams in a 100 milliliter beaker containing a Teflon coated magnetic stirring bar. Cover the beaker with a watch glass and stir until the subtle trimethyl ammonium bromide is completely dissolved. Add 7.37 milliliters of tetraethyl ortho silicate.

That is 6.88 grams to the beaker dropwise then cover the flask with a watch glass and let the solution stir overnight. The next day. Prepare a one molar st strontium chloride hexahydrate solution by dissolving 6.6654 grams of strontium chloride hexahydrate salt in milli Q water in a 25 milliliter erlenmeyer flask.

Gently shake the flask with a small volume of Milli Q water to dissolve the strontium salt. Once the strontium chloride hexahydrate salt is completely dissolved, fill the flask with Milli Q water and close it with a plastic cap. Next, add two milliliters of the one molar aqueous strontium, two plus solution to the 100 milliliter glass beak containing the solution that was left stirring overnight.

Stir the solution for 25 minutes. To prepare the substrates. Cut silicon slabs of about two centimeters by five centimeters out of a two inch P type silicon.

1 0 0 wafer with a thickness of 200 microns by cleaving the wave in a direction. Parallel the wafer flat just before the deposition of the gels. Clean the substrates with ethanol, then use a compressed nitrogen flow to accelerate the drying process.

Following this, establish a dip coating sequence by selecting the initial and final positions, taking into account the silicon slab length and the solution level so that the slab is at least two centimeters above the solution at the starting position and one centimeter above the bottom of the beaker. At the end of the immersion set the immersion and withdrawal speeds to 150 milliliters per minute and the immersion time to zero. After the solution has been prepared, place the beaker with the solution in a well-centered position beneath the silicon slab hanging from the dip coder arm.

Next, execute the dip coating sequence. When finished, unclip the silicone slab from the dip coder arm. At this point, program a furnace to perform the following thermal treatment in air atmosphere.

Place the dip coated silicone substrates in an Illumina boat and place it in the furnace. Then execute the thermal treatment following thermal treatment. Immerse the crystallized films for three hours in concentrated nitric acid in order to remove the accumulations of strontium, two plus that have been exposed to the film surface during the crystallization.

Finally, rinse the films first with deionized water and then with ethanol after deposition. The bluish greenish appearance of the substrate is indicative of good distribution of strontium two plus over the film. If the phase separation has occurred and presents a periodicity close to that of the laser wavelength, diffraction spots can be observed.

A straightforward examination of the material reveals a phase separation resulting in a macro pore structure and a strontium two plus distribution at the edge of the macro pores. This scanning electron microscopy field emission image reveals to what extent the initial macroporous structure has been preserved upon crystallization, cross-sectional, high resolution transmission electron microscopy and x-ray diffraction Studies confirm the 1 0 0 quartz orientation and the high quality epit taxal growth of quartz thin films on silicon 1 0 0 substrates. The 3D model shows the in plain epit taxal relationship between the quartz film in orange and the silicon substrate in gray viewed along the 0 1 1 zone axis.

If the film is piso electric, it deforms under the applied voltage, and this can be detected through the deflection of the tip at a particular resonance frequency by using piso response force microscopy technique. This deflection amplitude is proportional to the amplitude of the applied AC field and the Piso electric coefficient is of the order of two TERs per volt. After watching this video, you should be able to prepare Aachi core films, but don't forget to use fresh extraction solution and also work under a relative humidity below 50%This methodology can provide news inside in the catalytic and kinetic role of alkaline earth metals during the diversification silica process, which enables to oppresses control over the synthesis of quats in different forms.

One of the advantages of this method is that it can be combined with emerging nano fabrication techniques or conventional lithography widely used in the microelectronic industry in order to produce sensing devices.