The Science of Molecular Precursor Method

Nagai, Hiroki; Sato, Mitsunobu

doi:10.1002/9781119407652.ch1

Cited by 7 publications

(8 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shrinkage rate and the packing of the precursor film on the substrate depend on the chain length of the alkylamine used in the synthesis [43]. It was suggested that the crystallite size of the metal oxide obtained via the MPM method will be smaller than that obtained from the sol-gel process [44], because the nucleation process in the sol-gel method during heat treatment is slower, as the polymeric chains rearrange to form the basic core structure of the metal oxide, resulting in relatively large crystallites.…”

Section: Crystal Structure and Particle Sizementioning

confidence: 99%

“…It is, however, worth noting that the surface roughness of the ZnO thin film may also be affected by other factors and does not only depend on the crystallite size. Other parameters such as shape of the nanostructures, deposition conditions, and chemical reactions in the precursor solutions may also affect the surface roughness of ZnO thin films [43,44]. The influence of complexing agents on the grain size and surface roughness of ZnO thin films was described in detail by Nesheva et al [39].…”

Section: Crystals 2019 9 X For Peer Review 6 Of 11mentioning

confidence: 99%

See 1 more Smart Citation

Structural and Optical Properties of ZnO Thin Films Prepared by Molecular Precursor and Sol–Gel Methods

et al. 2020

View full text Add to dashboard Cite

Zinc oxide (ZnO) is a versatile and inexpensive semiconductor with a wide direct band gap that has applicability in several scientific and technological fields. In this work, we report the synthesis of ZnO thin films via two simple and low-cost synthesis routes, i.e., the molecular precursor method (MPM) and the sol–gel method, which were deposited successfully on microscope glass substrates. The films were characterized for their structural and optical properties. X-ray diffraction (XRD) characterization showed that the ZnO films were highly c-axis (0 0 2) oriented, which is of interest for piezoelectric applications. The surface roughness derived from atomic force microscopy (AFM) analysis indicates that films prepared via MPM were relatively rough with an average roughness (Ra) of 2.73 nm compared to those prepared via the sol–gel method (Ra = 1.55 nm). Thin films prepared via MPM were more transparent than those prepared via the sol–gel method. The optical band gap of ZnO thin films obtained via the sol–gel method was 3.25 eV, which falls within the range found by other authors. However, there was a broadening of the optical band gap (3.75 eV) in thin films derived from MPM.

show abstract

Section: Crystal Structure and Particle Sizementioning

confidence: 99%

Section: Crystals 2019 9 X For Peer Review 6 Of 11mentioning

confidence: 99%

Structural and Optical Properties of ZnO Thin Films Prepared by Molecular Precursor and Sol–Gel Methods

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[31,32] This technique is a promising one-step route that provides excellent homogeneity and control over the higher concentration and distribution of dopants in the metal oxide matrix. [33] Subsequently, the fabrication of Ag-NP/TiO 2 composite thin films has been achieved by employing MPM. [33][34][35][36] To fabricate Ag-NPs/TiO 2 composite thin films with high concentrations of Ag (up to 80 mol%), the precursor films can be heated to specific temperatures using the MPM method.…”

Section: Doi: 101002/admi202400035mentioning

confidence: 99%

Antibacterial Activity of Visible Light Responsive‐Silver‐Nanoparticle/Titania Composite Thin Films with Unprecedently Higher Amounts of Silver

Daniel,

Joseph,

Uahengo

et al. 2024

Adv Materials Inter

View full text Add to dashboard Cite

To study the antibacterial efficacy of metallic Ag nanoparticle/titania (Ag‐NP)/TiO2 composite thin films against Escherichia coli (ATCC 25922), COMP‐Agn with various amounts of Ag (10 mol% ≤ n ≤ 80 mol%) are fabricated on a quartz glass substrate at 600 °C using the molecular precursor method. The films are characterized by X‐ray diffraction, X‐ray photoelectron, scanning electron microscopy, transmission electron microscopy, photoluminescence, and UVvis techniques. The analysis reveals that the films are composed of metallic Ag‐NPs embedded in a mixture of anatase and rutile matrix, with a volumetric fraction of Ag ranging from 0.18 to 0.68. The antibacterial activity of the TiO2 thin film and COMP‐Agn are determined by disk diffusion and viable cell count methods. Neither pure TiO2 nor pure Ag films exhibit any discernible antibacterial under dark and visible light. The antibacterial of Ag content in composite films is observed to persist for a maximum increase of 70%. The model is proposed on the basis of photoexcited electron transfer from Ag NPs to the TiO2 conduction band of COMP‐Agn, which clarifies the main factors affecting the photoresponse and the excellent response to visible light via surface plasmon resonance.

show abstract

“…As per MPM, a precursor solution containing a Ti 4+ compound of EDTA, S TiO2 , was prepared, as reported by Sato and his team [21,[58][59][60]. A silver acetate-ethanol solution, S Ag , was prepared using a technique we recently disclosed, [21][22][23] to fabricate AgNPs for exploitation in composite thin films.…”

Section: Preparation Of Coating Solutions and Fabrication Of Comp-agnmentioning

confidence: 99%

The photon‐electrical conversion efficiency of dye‐sensitive solar cells fabricated using a highly conductive silver‐nanoparticle/titania photocathode

et al. 2023

View full text Add to dashboard Cite

The TiO2 thin film, Ag NP and three Ag‐NP/TiO2 composite thin films (COMP‐Agn; n = 20, 50, and 75 Ag mol%) were successfully fabricated on quartz glass. The optical properties of the composite electrodes were investigated, and the results indicate a surface plasmonic resonance peak at 410 nm while the electrical resistivity of the composite thin films improved up to 6.9 × 10−5 Ω cm. The photo‐response threshold of the Ag‐NP/TiO2 composite thin films was enhanced and shifted into the visible and near‐infrared when the chlorophyll dye was adsorbed onto them. The hall effect was performed on the fabricated thin films and the charge carrier concentrate value confirmed that the Ag/TiO2 with Ag concentrate >45% are found to be p‐type. The n‐types were observed till the Ag content in TiO2 was increased up to 45 mol%. COMP‐Ag75 has a charge carrier concentration of 1.3 × 10−19 cm−3 as a p‐type electrode was then employed to construct a p‐DSSC. Such enhancement on photovoltaic activity can be attributed to the generated Z‐scheme system in the anatase/rutile phase‐junction Ag/TiO2 photocathode enhances the separation, diffusion, and transformation of electron/hole pairs inside the structure. This p‐DSSC exhibits a photon‐electrical conversion efficiency (PCE) of 0.37%. The PCE recorded is equal to or greater than those of traditional high‐efficiency n‐DSSCs. This allows the creation of a new generation of photocathodic p‐DSSCs with previously unheard‐of unprecedentedly high concentrations of Ag (up to 80 mol%) evenly scattered in a TiO2 matrix, and this efficacy is the highest ever reported for a p‐type working Ag/TiO2/chlorophyll/iodine electrode. This may enable the use of this electrode as a component of photosensitizer tandem devices.

show abstract

The Science of Molecular Precursor Method

Cited by 7 publications

References 53 publications

Structural and Optical Properties of ZnO Thin Films Prepared by Molecular Precursor and Sol–Gel Methods

Structural and Optical Properties of ZnO Thin Films Prepared by Molecular Precursor and Sol–Gel Methods

Antibacterial Activity of Visible Light Responsive‐Silver‐Nanoparticle/Titania Composite Thin Films with Unprecedently Higher Amounts of Silver

The photon‐electrical conversion efficiency of dye‐sensitive solar cells fabricated using a highly conductive silver‐nanoparticle/titania photocathode

Contact Info

Product

Resources

About