Gold nanoparticle SERS substrates sustainable at extremely high temperatures

Cortes-Vega, Fernando D.; Martínez-Torres, P.; Molina, Juan Pichardo; Ortiz, Nikte M. Gomez; Hadjiev, V. G.; Zárate‐Medina, J.; Hernandez, Francisco C. Robles

doi:10.1039/c7tc00527j

Cited by 22 publications

(11 citation statements)

References 30 publications

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“…Gold nanoparticles (Au NPs) have a wide spectrum of potential applications due to their unique properties, which are in many ways different compared to its bulk form. They find use in laboratories such as basic substrate for bio-sensing and bio-imaging 1 – 5 , in Surface Enhanced Raman Scattering (SERS) as one of the most effective substrate 6 – 8 , or in the detection of toxic compounds 9 – 12 . Although gold in bulk is poorly active as a catalyst, in the form of gold nanoparticles exhibits outstanding catalytic activity 13 , 14 , especially in redox reactions, such as in the catalytic low-temperatures oxidation of carbon monoxide 15 – 17 , in oxidation of alcohols 18 , hydrogenation of 4-nitrophenol 19 – 21 , or in selective epoxidation reactions 22 , 23 .…”

Section: Introductionmentioning

confidence: 99%

Simple size-controlled synthesis of Au nanoparticles and their size-dependent catalytic activity

Suchomel

Kvı́tek

Prucek

et al. 2018

Sci Rep

319

169

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The controlled preparation of Au nanoparticles (NPs) in the size range of 6 to 22 nm is explored in this study. The Au NPs were prepared by the reduction of tetrachloroauric acid using maltose in the presence of nonionic surfactant Tween 80 at various concentrations to control the size of the resulting Au NPs. With increasing concentration of Tween 80 a decrease in the size of produced Au NPs was observed, along with a significant decrease in their size distribution. The size-dependent catalytic activity of the synthesized Au NPs was tested in the reduction of 4-nitrophenol with sodium borohydride, resulting in increasing catalytic activity with decreasing size of the prepared nanoparticles. Eley-Rideal catalytic mechanism emerges as the more probable, in contrary to the Langmuir-Hinshelwood mechanism reported for other noble metal nanocatalysts.

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Section: Introductionmentioning

confidence: 99%

Simple size-controlled synthesis of Au nanoparticles and their size-dependent catalytic activity

Suchomel

Kvı́tek

Prucek

et al. 2018

Sci Rep

319

169

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“…The presence of Al 2 O 3 and Au particles were completely confirmed in the line with the standard patterns. The sample shows the exact same diffraction peaks with lower intensities after impregnation which indicates the retained structure after modification process, and intensities of the peaks became lower with increasing the PEI contents (Zaman et al, 2010;Strunk et al, 2011;Cortes Vega et al, 2017; Figure 2). According to EDS analysis presented in Figure 1, The catalyst has a porous structure which could be in association with the chemical composition of the coat (mostly Al 2 O 3 , ZrO 2 ).…”

Section: Resultsmentioning

confidence: 92%

Polyethyleneimine (PEI) Functionalized Metal Oxide Nanoparticles Recovered From the Catalytic Converters of Spent Automotive Exhaust Systems and Application for CO2 Adsorption

2020

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A novel CO 2 sorbent was prepared from the catalytic converters of spent automotive exhaust system by modifying with polyethyleneimine (PEI) through wet impregnation method. The prepared sorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and Brauer-Emmett-teller (BET) analysis before and after functionalization. Different PEI loadings were employed to study the adsorption performance of as-prepared sorbent. The characterization results showed no significant change in the structure, but the surface area was decreased after modification with amine groups. The adsorption was remarkably improved by increasing the PEI loading. The optimal PEI loading on the as-prepared sorbent was 60 wt.%. At optimal PEI loading, the CO 2 adsorption reached to 101.3 mg (g sorbent) −1 at 70 • C and partial pressure of 100 kPa. Further PEI loading had a negative effect on the adsorption. The CO 2 adsorption capacity increased to 125.2 mg (g sorbent) −1 in the presence of 1 vol.% of the H 2 O moisture. Results confirmed the high performance of novel sorbent compared to other porous sorbents such as carbon-based materials. Adsorption/desorption cycles revealed that the PEI-impregnated sorbent can be satisfactorily regenerated after CO 2 adsorption process.

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“…In Figure 1a and 1b are showed the well crystallized phases from both oxides, which are in good agreement with the pattern references JCPDS 00-036-1451 and 00-087-0653 for ZnO (zincite) and MgO (periclase), respectively. The presence of gold is evident in both samples by the identification of the reflections (111), (200), (220) and (311) according to the standard reference JCPDS 04-0784 [5]. The SEM images displayed in Figure 2a and b show plates and spheres morphology for ZnO and MgO, respectively.…”

mentioning

confidence: 91%

“…The presence of gold is evident in both samples by the identification of the reflections (111), (200), (220) and (311) according to the standard reference JCPDS 04-0784 [5]. The SEM images displayed in Figure 2a and b show plates and spheres morphology for ZnO and MgO, respectively.…”

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confidence: 95%

ZnO and MgO Decorated with Spherical Gold Nanoparticles

et al. 2018

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ZnO and MgO are attractive materials for its use in applications of catalysis, optics, chemical and electrochemical biosensors, optoelectronics, bioactivity and many others [1,2]. Gold nanoparticles are able to generate localized surface plasmon resonance. The addition of these nanoparticles to metal oxide materials like ZnO and MgO could improve their optical properties. It has been reported that the surface plasmon of Au nanoparticles enhanced MgZnO used as ultraviolet photodetector [3]. In this work we present the synthesis and process for decoration of these oxides with spherical gold nanostructures, as well as their characterization by means of SEM and XRD.The ZnO and MgO were synthesized from Zinc and Magnesium nitrate hexahydrate (Zn(NO3)•6H2O and Mg(NO3)•6H2O), using NaOH as the precipitant agent. The solutions of (Zn(NO3)•6H2O and Mg(NO3)•6H2O) were prepared at 0.2 M, then the NaOH solution at 0.4 M (100 ml) was dropped slowly at room temperature and constant stirring until the end of the reaction. The as-obtained precipitates (hydroxides) were washed several times with water and ethanol to ensure the elimination of residual nitrates. The products obtained after washing were dried at 50 ºC for 24 h and then calcined at 500° C for 2 h to obtain ZnO and MgO. In order to synthesize the Au nanoparticles, we followed the process reported in ref.[4], using gold (III) chloride trihydrate and trisodium citrate (TSC) as raw materials. Initially, 50 ml of deionized water and 50 mg of TSC were added into a flask and heated to boiling temperature with vigorous stirring. Then, 150 ml of HAuCl4 0.25 M were added keeping temperature and stirring up to the solution turns into a ruby-red color, which indicates the formation of the Au nanoparticles. The oxide powders were mixed with 120 ml of colloidal Au nanoparticles and stirred for 1 h followed by a drying process at 100 ºC for 24 h. These powders were placed into a stainless steel die to obtain green pellets of 1 cm of diameter and 1.5 mm of thickness. The green pellets were calcined at 1000 ºC for 2 h using a conventional furnace. The crystal structure of both ZnO\Au and MgO\Au pellets was identified using X ray diffraction.In Figure 1a and 1b are showed the well crystallized phases from both oxides, which are in good agreement with the pattern references JCPDS 00-036-1451 and 00-087-0653 for ZnO (zincite) and MgO (periclase), respectively. The presence of gold is evident in both samples by the identification of the reflections (111), (200), (220) and (311) according to the standard reference JCPDS 04-0784 [5]. The SEM images displayed in Figure 2a and b show plates and spheres morphology for ZnO and MgO, respectively. Au nanoparticles were spheres with homogeneous distribution for both cases, ZnO and MgO. Surprisingly, the size of the Au nanoparticles increased considerably from 20 nm (asynthesized nanoparticles) to 276 ±53 nm for the ZnO decorated with Au nanoparticles and, similarly, the Au nanoparticles deposited on MgO showed an increase in size from 20 nm to 1...

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Gold nanoparticle SERS substrates sustainable at extremely high temperatures

Abstract: We report a technology for supporting gold nanoparticles (GNPS) with preserved SERS active substrates capable of sustaining extreme temperatures as high as the melting point of gold.

Cited by 22 publications

References 30 publications

Simple size-controlled synthesis of Au nanoparticles and their size-dependent catalytic activity

Simple size-controlled synthesis of Au nanoparticles and their size-dependent catalytic activity

Polyethyleneimine (PEI) Functionalized Metal Oxide Nanoparticles Recovered From the Catalytic Converters of Spent Automotive Exhaust Systems and Application for CO2 Adsorption

ZnO and MgO Decorated with Spherical Gold Nanoparticles

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