Ag and Cu doped ZnO nanowires: A pH-Controlled synthesis via chemical bath deposition

Rakhsha, Amir Hossein; Abdizadeh, Hossein; Pourshaban, Erfan; Golobostanfard, Mohammad Reza; Mastelaro, Valmor Roberto; Montazerian, Maziar

doi:10.1016/j.mtla.2019.100212

Cited by 31 publications

(24 citation statements)

References 45 publications

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“…[13][14][15] The reaction kinetics to form the copper oxide phases are certainly favorable in the present case. The formation of a copper oxide phase is further confirmed by highmagnification FESEM images of the samples with pH0 values of 6.9, 7.1, and 7.2, as presented in Figure 5b-d 25,27 and is usually associated with the presence of Cu in interstitial sites of the lattice. Moreover, no epitaxial strain is expected to occur in the relieved through the creation of extended defects including misfit dislocations.…”

Section: Effects Of the Ph 0 Of The Solution And The Presence Of Cu(no 3 ) 2 In The Chemicalmentioning

confidence: 60%

“…refs [24][25][26][27] . The number density of ZnO NWs correlatively decreases from 1.6 ± 0.3 to 0.8 ± 0.2 NW/µm 2 .…”

Section: Effects Of the Ph 0 Of The Solution And The Presence Of Cu(no 3 ) 2 In The Chemicalmentioning

confidence: 99%

“…A couple of previous investigations have reported some experimental evidence of the incorporation of Cu into ZnO NWs and nanoparticles grown by CBD by generally adding copper nitrate (Cu(NO 3 ) 2 ) in the bath. [22][23][24][25][26][27] Other investigations have reported the use of copper chloride, copper acetate, and copper sulfate. [28][29][30] However, the required conditions in the chemical bath for inducing the Cu incorporation and the nature of the related mechanisms have not been described in detail.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the incorporation of Cu into ZnO NWs has often been associated with a strong increase in their diameter, suggesting efficient electrostatic interactions between the Cu(II) ions in the bath and ZnO NW facets. [24][25][26][27] In the present article, we perform the growth of ZnO NWs by CBD on top of Au seed layers with a constant [Cu(NO 3 ) 2 ]/[Zn(NO 3 ) 2 ] ratio of 5 %. To elucidate the effects of pH 0 on the Cu incorporation in the as-grown ZnO NWs, it is systematically varied over a broad range of 6.9-10.9.…”

Section: Introductionmentioning

confidence: 99%

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Chemical Bath Deposition of ZnO Nanowires Using Copper Nitrate as an Additive for Compensating Doping

et al. 2021

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The controlled incorporation of dopants like copper into ZnO nanowires (NWs) grown by chemical bath deposition (CBD) is still challenging despite its critical importance for the development of piezoelectric devices. In this context, the effects of the addition of copper nitrate during the CBD of ZnO NWs grown on Au seed layers are investigated in detail, where zinc nitrate and hexamethylenetetramine are used as standard chemical precursors and ammonia as an additive to tune the pH. By combining thermodynamic simulations with chemical and structural analyses, we show that copper oxide nanocrystals simultaneously form with ZnO NWs during the CBD process in the low-pH region associated with a large supersaturation of Cu species. The Cu(II) and Zn(II) speciation diagrams reveal that both species show very similar behaviors, as they predominantly form either X 2+ ions (with X = Cu or Zn) or X(NH3)4 2+ ion complexes, depending on the pH value. Owing to their similar ionic structures, Cu 2+ and Cu(NH 3 ) 4 2+ ions preferentially formed in the low-and high-pH regions, respectively, are able to compete with the corresponding Zn 2+ and Zn(NH3)4 2+ ions to adsorb on the c-plane top facets of ZnO NWs despite repulsive electrostatic interactions, yielding the significant incorporation of Cu. At the highest pH value, additional attractive electrostatic interactions between the Cu(NH 3 ) 4 2+ ion complexes and negatively charged c-plane top facets further

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Section: Effects Of the Ph 0 Of The Solution And The Presence Of Cu(no 3 ) 2 In The Chemicalmentioning

confidence: 60%

“…refs [24][25][26][27] . The number density of ZnO NWs correlatively decreases from 1.6 ± 0.3 to 0.8 ± 0.2 NW/µm 2 .…”

Section: Effects Of the Ph 0 Of The Solution And The Presence Of Cu(no 3 ) 2 In The Chemicalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical Bath Deposition of ZnO Nanowires Using Copper Nitrate as an Additive for Compensating Doping

et al. 2021

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“…For pH range of 5 to 3, the dark brown precipitation formed when the ZnO was oxidized equitably quickly to zinc hydroxide and the TA was mostly undissociated. It should be noted that only at pH more than 7 the formation of ZnO complexes [ 33 , 34 ] takes place as they are highly oxidized and slowly lost from the solution. As the complexes formed with the oxidized ZnO, the Zn ions are released, and black ZnO tannate is precipitated.…”

Section: Resultsmentioning

confidence: 99%

pH-Dependent Formation of Oriented Zinc Oxide Nanostructures in the Presence of Tannic Acid

2020

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To crucially comprehend the relaying factors behind the growth mechanism of ZnO nanostructures, the needs to understand the cause of preferences in the enhancement of desired physicochemical properties are essential. The particular oriented attachment (OA) is believed to become the cause of the classical growth pattern of ZnO nanostructures which is mainly controlled by the Ostwald ripening (OR) process. In the present work, the concerns over the systematic changes in size and the morphological surface of ZnO nanostructures upon exposure to tannic acid (TA) prepared by drop-wise method turns the particles to different surface adjustment state. Here, we assessed the TA capping ability and its tendency to influence the OA process of the ZnO nanostructures. The detailed process of the growth-based TA system via transmission electron microscopy (TEM), scanning electron microscopy (SEM), and FFT autocorrelation revealed the pH effect on their physical properties which proved the transition surface properties state of the particles from rough to smooth states due to oriented attachment. For pure ZnO nanostructures, the surface is almost smooth owing to the strong bonding particles which are then changed to coarsened surface structures upon the introduction of TA. Strong surface adsorption of Zn cations and phenol ligands mediated the agglomerated nanocrystals, surprisingly with smaller nanostructures dimension.

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Introduction and Types of Semiconducting Hybrid Nanostructures for Optoelectronic Devices

Ravikumar

Garai

2022

1D Semiconducting Hybrid Nanostructures

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Ag and Cu doped ZnO nanowires: A pH-Controlled synthesis via chemical bath deposition

Cited by 31 publications

References 45 publications

Chemical Bath Deposition of ZnO Nanowires Using Copper Nitrate as an Additive for Compensating Doping

Chemical Bath Deposition of ZnO Nanowires Using Copper Nitrate as an Additive for Compensating Doping

pH-Dependent Formation of Oriented Zinc Oxide Nanostructures in the Presence of Tannic Acid

Introduction and Types of Semiconducting Hybrid Nanostructures for Optoelectronic Devices

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