CELERINET AÑO 7 VOL 2

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CELERINET JULY - DECEMBER 2019Au PARTICLES DEPOSITION ON NaClSUBSTRATESDEPOSICIÓN DE PARTÍCULAS DE AuEN SUSTRATOS DE NaClÁngel Salvador Pérez Blanco, Diana Marahí Alanís Silva, Juan Pablo Salinas EstevanéUANL - FCFM, San Nicolás de los Garza, Nuevo León, MéxicoABSTRACTGold nanoparticles were deposited on NaCl substrates by high vacuum evaporation at moderatetemperatures. The morphology of the nanoparticles was analyzed by scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The gold nanoparticles are in the 10nm sizerange and possess different morphologies being the decahedral one the most prominent. Geometricalpatterns such as squares and lines of the deposited Au nanoparticles on the NaCl substrate wereobserved by SEM analysis, this may be a way to do nanodecoration of different species of metalsand alloys on a suitable surface. Electron diffraction analysis was performed on the depositedparticles showing that the gold deposited nanoparticles are impurity free. These results make highvacuum evaporation a relevant technique to obtain not only homogeneous nanoparticles depositedon different surfaces, but also a fast and reliable way to make nanodecoration.Keywords: high vacuum, NaCl, GoldRESUMENLas nanopartículas de oro fueron depositadas en sustratos de NaCl por evaporación a altovacío a temperaturas moderadas. La morfología de las nanopartículas fue analizada mediante unmicroscopio electrónico de barrido (MEB) y un microscopio electrónico de transmisión (MET).Las nanopartículas de oro están en un rango de 10 nm y poseen diferentes morfologías siendo laestructura decahedral la más prominente. Patrones geométricos tales como cuadrados y líneas delas nanopartículas de Au depositadas en el substrato de NaCl se pudieron observar a través delanálisis de MEB, esto podría ser una forma para realizar nanodecoración de diferentes especiesde metales o aleaciones en una superficie apropiada. El análisis de difracción de electrones fuellevado a cabo en las partículas depositadas mostrando que las nanopartículas depositadas estánlibres de impurezas. Estos resultados hacen de la evaporación de alto vacío una técnica relevantepara no solo obtener nanopartículas homogéneas depositadas en diferentes superficies, sinotambién una forma rápida y confiable de realizar nanodecoración.Pérez, Á., Alanís, D. & J.P. Salinas. (2019). Au Particles Deposition on NaCl Substrates. Celerinet. 7(2), 16-21.10 16
RESEARCH/ PHYSICSPalabras clave: alto vacío, NaCl, oro1. INTRODUCTIONHigh vacuum evaporation of materialsresulting on nanoparticles with differentshapes and a moderate control in size hasbeen shown before such as the work ofRobinson [2] et al. where palladium particleswere deposited on NaCl and mica substrates,on a similar research, Rupprechter [3] et al.obtained thin films catalysts with particles ofPt, Rh, Ir and Pd also on NaCl substrates. Inyet another work, Fukaya [4] et al. depositedPalladium particles on NaCl, KCl, KBr andKI substrates. Khanuja [5] et al. investigatedthe hydrogenation properties of Cu/Pd bimetallayers deposited on glass substrates. Thedeposition of pure metals on a suitable surfaceat different rates and temperatures, may offerproperties which are greater than that of bulksize when nanostructures are created [6], evenfor this scale, the geometry, and the thickness ofthe deposited layers of materials can have a bigimpact on the final properties of the materials.High vacuum evaporation of metals results inan easy and fast way to produce nanostructures,thin films [4,5] and even quantum dots thatpossess different physical-chemical propertiesdepending on different aspects such as size,thickness, crystal structure etc.In this research, we investigated the highvacuum evaporation of gold particles depositedon NaCl substrates performed at 573.15Kto 623.15K. Decahedral shape was the mostfrequently observed such as in the work ofRobinson et al. [2].2. EXPERIMENTAL SET UPThe deposition of gold nanoparticles andtheir characterization were carried out in theAdvanced Engineering and Technology (AET)Building and the Kleberg Advanced MicroscopyCenter of The University of Texas at SanAntonio (UTSA). The equipment that was usedto perform the experiments and characterizationof the obtained materials were a High VacuumEvaporation Chamber, a Hitachi STEM S500Scanning Electron Microscope and a JEOL1230 Transmission Electron Microscope(TEM), gold wire, NaCl prism.2.1 EXPERIMENTALGold DepositionGold deposition on NaCl substrates wascarried out using a 1/16in diameter gold wiresubjected to a high vacuum of 10 -5 Torr using aturbo molecular pump above a 1x1x3cm pureNaCl substrate. The temperatures that werereached were 573.15K, 600.15K and 623.15K.When pressure of 10-5Torr was reached on theevaporation chamber, the deposition began fora maximum of 1min, and then the NaCl wascleaved on its transversal section.SEM and TEM AnalysisSEM and TEM images of the depositednanoparticles were obtained. Diversemorphologies were observed on the goldparticles being the most prominent one thedecahedral geometry. The size remained veryhomogeneous ranging around 10nm.3. RESULTS3.1 SEM and TEM MicrographsThe most representative SEM and TEMimages that were obtained on the deposition ofgold nanoparticles are shown below.17
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