Sun-light-driven photocatalytic activity by ZnO/Ag heteronanostructures synthesized via a facile thermal decomposition approach

Kandula, Syam; Jeevanandam, P.

doi:10.1039/c5ra14179f

Cited by 47 publications

(19 citation statements)

References 62 publications

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“…Moreover, the chemical shift validates the fact that Al atom substituted the Zn atom [4]. The O1s spectrum of AZO (Fig.…”

Section: Introductionsupporting

confidence: 72%

Effect of oxygen deficiency on vis‐light photocatalytic activity in AZO

2019

Micro & Nano Letters

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Aluminium (Al)-doped zinc oxide (ZnO) photocatalyst with surface oxygen vacancies was synthesised by one-step hydrothermal method. The oxygen vacancies drawn into ZnO surface by Al doping can effectively enhance visible (vis)-light photocatalytic activity. The crystal structure, chemical composition and morphology of Al-doped ZnO (AZO) photocatalysts were characterised by X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy (TEM). The optical property was characterised by ultraviolet-vis diffuse reflectance spectra. High-resolution TEM and electron paramagnetic resonance spectra mainly confirm the existence of oxygen vacancies on the ZnO surface. Oxygen vacancies result in a narrowing of the bandgap (E g = 2.92 eV) and an increase in the vis-light absorption of the sample. AZO sample exhibits good cycling stability, and no obvious decrease in the photocatalytic activity was observed even after four cycles.

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“…Moreover, the chemical shift validates the fact that Al atom substituted the Zn atom [4]. The O1s spectrum of AZO (Fig.…”

Section: Introductionsupporting

confidence: 72%

Effect of oxygen deficiency on vis‐light photocatalytic activity in AZO

2019

Micro & Nano Letters

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“…where 'β' is FWHM (in radians), 'θ' the angle of reflection and 'λ' the wavelength of X-ray radiation used. Moreover, the bright patterns of SAED (right part: H6 & A3) are matching with wurtzite ZnO planes, thereby revalidating the XRD analyses [27]. The developed material exhibits 1D and 2D nanostructures (nanorods and nanoplates) depending upon the time of hydrothermal reaction (Fig.…”

Section: Resultsmentioning

confidence: 62%

Development of Ag/ZnO nanorods and nanoplates at low hydrothermal temperature and time for acetone sensing application: an insight into spillover mechanism

et al. 2019

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Nanostructure synthesis at low temperature with high purity and yield has a great potential in the present competitive research and development of nanomaterials for varieties of application. Here, we demonstrate the facile hydrothermal synthesis of ZnO nanocomposites at low hydrothermal temperature and time. With barely 80 °C hydrothermal temperature and 2 h of reaction time, ZnO nanorods were successfully synthesized, while by slightly increasing the reaction time (6 h-and-on), nanoplates of the same material were developed. Both the obtained nanostructures were analyzed using physio-chemical characterizing tools and examined for practical relevance as gas sensing material. The optimized sample was further treated to Ag loading (1-5 mol%) for lowering the operating temperature of the sensor. ZnO sample with 3 mol% Ag loading showed excellent sensitivity of 92.7% for 1000 ppm of acetone concentration with a drop in the operating temperature from 325 °C (Pristine ZnO) to 250 °C (Ag-loaded ZnO). The morphological correlation with reaction time and thereby sensitivity and spillover mechanism are discussed. Graphic abstractKeywords Composite materials · Hydrothermal process · Ag/ZnO · Sensors · Acetone However, in the present industrial scenario, chemical synthesis of these nanomaterials is facing enormous challenges in terms of trimming the overall process span and production at low temperature. Though hydrothermal synthesis route offers decent advantages over conventional synthesis routes, its high reaction temperature (hence high pressure) and longer reaction time are the major concerns at pilot/industrial-scale production. However, by effective tuning of reaction temperature in combination with the reaction time, one can get the same nanomaterial in the desired morphology. Here, the problem addressed in the paper is to ease the high temperature and time-consuming process for synthesizing ZnO-based nanostructures. The efforts were made to custom tailor the ZnO nanostructures at lower hydrothermal temperature (80 °C) and shorter reaction time (2-10 h). With barely 80 °C hydrothermal temperature and 2 h of reaction time, ZnO nanorods were successfully synthesized, while by slightly increasing the reaction time (6 h-and-on), nanoplates of the same material were developed. The obtained nanostructures are Compliance with ethical standardsConflict of interest The authors declare that there is no competing interest whatsoever.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…The biomimetic approach of unlocking the ‘wonders of multifunctional metalloenzymes’ in designing ‘cooperative heteronanostructures’, have sparked up new horizons in the realm of advanced catalysis . The synergism of two different metal centers acting in concert in a single structure endorses cooperative redox chemistry, resulting in enhancement of properties and incorporation of useful functionality .…”

Section: Introductionmentioning

confidence: 99%

Sustainable Redox Chemistry Route to Multifaceted Fe‐Pd Heteronanostructure: Delving into the Synergistic Influence in Catalysis

Pramanik

Das

et al. 2017

ChemistrySelect

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The biomimetic concept to decipher the ‘enigma of metalloenzymes’ in integrating two metals in designing a heteronanostructure with multifunctional attributes seems inspiring. In this pursuit, we report a versatile route to Fe−Pd heteronanostructure based on the redox chemistry utilizing the galvanic potentials of the metals, in lieu of an external reducing agent used so far. The synergism between two metal centers has been delved into for multifaceted catalytic applications. The synthesized nanomaterial has been extensively characterized by techniques such as UV‐Vis, FTIR, XRD, SEM‐EDX, HRTEM, BET, VSM, ICP and Mössbauer spectroscopy. The formation of the heteronanostructure with Fe and Pd is clearly evident from HRTEM image and EDS mapping analysis. Mössbauer spectra are consistent with the superparamagnetic nature of the material. Fe−Pd heteronanostructure showed excellent aqueous‐phase catalytic activities for Suzuki coupling reactions with challenging substrates like heteroaryl bromides and aryl chlorides, and reductions of 4‐nitrophenol to 4‐aminophenol and Cr(VI) to Cr(III). Interestingly, in all the three catalytic reactions, Fe−Pd heteronanostructure showed superior activity over its monometallic counterpart substantiating to the cooperative influence of the two metals. Low catalyst loading, shorter reaction times, ‘in water’ reactions for synthesis and catalysis and magnetic recyclability form the hallmark features of the heteronanostructure.

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Sun-light-driven photocatalytic activity by ZnO/Ag heteronanostructures synthesized via a facile thermal decomposition approach

Abstract: ZnO/Ag heteronanostructures with good photocatalytic activity towards photodegradation of methylene blue have been synthesized using a facile thermal decomposition approach.

Cited by 47 publications

References 62 publications

Effect of oxygen deficiency on vis‐light photocatalytic activity in AZO

Effect of oxygen deficiency on vis‐light photocatalytic activity in AZO

Development of Ag/ZnO nanorods and nanoplates at low hydrothermal temperature and time for acetone sensing application: an insight into spillover mechanism

Sustainable Redox Chemistry Route to Multifaceted Fe‐Pd Heteronanostructure: Delving into the Synergistic Influence in Catalysis

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