Sonochemical synthesis of PdO@silica as a nanocatalyst for selective aerobic alcohol oxidation

Seok, Seunghwan; Hussain, Muhammad Asif; Park, Kyun Joo; Kim, Do Hyun

doi:10.1016/j.ultsonch.2015.07.020

Cited by 22 publications

(8 citation statements)

References 27 publications

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“…The X-ray diffraction (XRD) patterns of Au@PdO NAs before and after treatment by NaBH 4 for different times are shown in Figure C. The diffraction peaks at 33.8, 42.1, 54.9, 60.4, 60.8, and 71.4° correspond to the (101), (110), (112), (103), (200), and (211) planes of the PdO shell, , and the remaining four characteristic diffraction peaks correspond to the (111), (200), (220), and (311) planes of the Au core . After being reduced by NaBH 4 , a new characteristic diffraction peak at 40.1° appears, which should be assigned as the Pd (111) plane, and the peak becomes intensive along with the increase of the reduction time.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Hydrogen-Sensing Performance of p-Type PdO by Modulating the Conduction Model

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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The implementation of the p-type metal oxide semiconductor (MOS) in modern sensing systems requires a strategy to effectively enhance its inherent low response. However, for p-type MOS sensors, conventional methods such as catalyst nanoparticle (NP) decoration and grain size regulation do not work as effectively as they do for n-type MOS sensors, which is basically due to the fact that the p-type MOS adopts an unfavorable parallel conduction model. Herein, taking Au@PdO as an example, we demonstrate that the conduction model of the p-type MOS can be manipulated into the series conduction model by inserting a high-conductive metallic core into less-conductive p-type MOS NPs. This unique series conduction model makes the sensor response of Au@PdO nanoparticle arrays (NAs) very sensitive to the catalyst NP decoration as well as the change of structural parameters. For example, Au@PdO NAs demonstrate an ∼9000 times increase in sensor response when decorated with Pd NPs, whereas there is only ∼100 times increase for PdO NAs. This greatly improved response value outperforms all previously reported PdO-based (and most other p-type semiconductor-based) H2 sensors, which helps the obtained sensor to achieve an ultralow detection limit of ∼0.1 ppm at room temperature. Additionally, Au@PdO NAs inherit the high surface reactivity and gas adsorption property of p-type PdO. As a result, the as-prepared sensor exhibits high humidity-resistive property and excellent selectivity. This work provides a new strategy to significantly enhance the sensing performance of p-type gas sensors by manipulating their conduction model.

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Section: Resultsmentioning

confidence: 99%

Enhancing the Hydrogen-Sensing Performance of p-Type PdO by Modulating the Conduction Model

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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“…[ 58,59 ] The fast and uniform deposition of metal NPs on the hBN surface is attributed to the efficient mass and heat transfer of the T–C flow with the unique regime characteristics. Compared to conventional methods for growth and deposition of nanoparticles on 2D materials, including sonication, hydrothermal, chemical reduction, and sintering methods, [ 60–62 ] the fluid‐dynamic‐induced synthesis enables a cost‐effective and high‐throughput production of nanoparticle‐deposited 2D nanohybrids with controlled size and uniformity at room temperature without reducing agents.…”

Section: Resultsmentioning

confidence: 99%

Large‐Scale Fast Fluid Dynamic Processes for the Syntheses of 2D Nanohybrids of Metal Nanoparticle‐Deposited Boron Nitride Nanosheet and Their Glycolysis of Poly(ethylene terephthalate)

Jeong

Jin

Park

et al. 2020

Adv Materials Inter

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Owing to the unique mass and heat transfer, fluidic‐flow control systems or reactors can potentially provide advantages for organic and inorganic syntheses compared to the static reactors. In this study, it is demonstrated that a fluid dynamic reactor based on Taylor–Couette (T–C) flow provides high‐throughput processes for the exfoliation of hexagonal boron nitride (hBN), syntheses of metal‐nanoparticle‐(NP)‐deposited hBN nanohybrids, and their glycolysis reactions of poly(ethylene terephthalate) (PET). The mechanical shear force and dynamic mixing behavior of the T–C flow lead to a stable colloidal suspension of exfoliated hBN sheets with a high exfoliation yield of 77.9% and high production rate of 0.48 g h−1. A fast synthesis of metal NPs (Pd, Pt, Ag, and RuO2 NPs) onto the hBN surface is achieved by using the controlled T–C flow within only 2 min owing to the efficient mass and heat transfer of the T–C flow. The T–C flow considerably reduces the reaction time (30 min) and temperature (100 °C) for the Pd/hBN‐catalyst‐based glycolysis reaction of PET to bis(2‐hydroxyethyl) terephthalate compared to those of the conventional static reaction that is performed above 200 °C for 120 min.

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“…In some studies, metal compound-based SiO 2 composites have been developed to form nanocatalysts. Kim et al employed a short-time sonochemical method for the synthesis of PdO-doped silica nanocomposites, 190 in which PdO nanoparticles were deposited on the silica surface without aggregation. Compared with unsupported PdO nanoparticles, the PdO-doped composites had higher catalytic activity and selectivity for the aerobic alcohol oxidation reaction due to the synergetic effect of PdO with the silica support.…”

Section: Inorganic Compositesmentioning

confidence: 99%

Sonochemical catalysis as a unique strategy for the fabrication of nano-/micro-structured inorganics

Dong

Zhang

et al. 2021

Nanoscale Adv.

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Sonochemical synthesis of PdO@silica as a nanocatalyst for selective aerobic alcohol oxidation

Cited by 22 publications

References 27 publications

Enhancing the Hydrogen-Sensing Performance of p-Type PdO by Modulating the Conduction Model

Enhancing the Hydrogen-Sensing Performance of p-Type PdO by Modulating the Conduction Model

Large‐Scale Fast Fluid Dynamic Processes for the Syntheses of 2D Nanohybrids of Metal Nanoparticle‐Deposited Boron Nitride Nanosheet and Their Glycolysis of Poly(ethylene terephthalate)

Sonochemical catalysis as a unique strategy for the fabrication of nano-/micro-structured inorganics

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