Theoretical and experimental studies of nucleation and interface structure between carbon nanotubes and metals

Wang, Gengjie; Zhang, Yaoyin; Zhu, Lu; Ma, Yujie; Zhang, Shumin; Huang, Zhifu; Cao, Zhenhua; Meng, Xiangkang

doi:10.1007/s10853-022-08080-0

Cited by 5 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[66] As shown in Figure S8a, Supporting Information, after being photoexcited by the pump laser with a wavelength of 400 nm, excitons in CdS are immediately generated and separated into free electrons and holes, contributing to the increase of GSB peak intensity within the first 900 fs. According to previous reports, [51,67] the GSB signal is attributed to the generation and quenching of photogenerated electrons. Therefore, the GSB peaks begin to decay after 0.9 ps due to the reduction of photogenerated electrons in the CB of CdS (Figure 5a).…”

Section: Fs-ta Spectroscopy Measurementmentioning

confidence: 59%

Dynamics of Electron Transfer in CdS Photocatalysts Decorated with Various Noble Metals

Meng,

Zhang,

Jiang

et al. 2023

Small

View full text Add to dashboard Cite

To address charge recombination in photocatalysis, the prevalent approach involves the use of noble metal cocatalysts. However, the precise factors influencing this performance variability based on cocatalyst selection have remained elusive. In this study, CdS hollow spheres loaded with distinct noble metal nanoparticles (Pt, Au, and Ru) are investigated by femtosecond transient absorption (fs‐TA) spectroscopy. A more pronounced internal electric field leads to the creation of a larger Schottky barrier, with the order Pt‐CdS > Au‐CdS > Ru‐CdS. Owing to these varying Schottky barrier heights, the interface electron transfer rate (Ke) and efficiency (ηe) of metal‐CdS in acetonitrile (ACN) exhibit the following trend: Ru‐CdS > Au‐CdS > Pt‐CdS. However, the trends of Ke and ηe for metal‐CdS in water are different (Ru‐CdS > Pt‐CdS > Au‐CdS) due to the influence of water, leading to the consumption of photogenerated electrons and affecting the metal/CdS interface state. Although Ru‐CdS displays the highest Ke and ηe, its overall photocatalytic performance, particularly in H2 production, lags behind that of Pt‐CdS due to the electron backflow from Ru to CdS. This work offers a fresh perspective on the origin of performance differences and provides valuable insights for cocatalyst design and construction.

show abstract

Section: Fs-ta Spectroscopy Measurementmentioning

confidence: 59%

Dynamics of Electron Transfer in CdS Photocatalysts Decorated with Various Noble Metals

Meng,

Zhang,

Jiang

et al. 2023

Small

View full text Add to dashboard Cite

show abstract

“…During the VACNT growth and Cu filling processes, not all Cu particles are fully encapsulated within the VACNTs. Some residual nanoparticles adhere to the external surfaces of the VACNTs due to surface energy interactions [ 68 ]. These surface-bound Cu nanoparticles, when exposed to air, readily oxidize to form CuO [ 69 ].…”

Section: Resultsmentioning

confidence: 99%

Field Emission Properties of Cu-Filled Vertically Aligned Carbon Nanotubes Grown Directly on Thin Cu Foils

Nwanno,

Thapa,

Watt

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

Copper-filled vertically aligned carbon nanotubes (Cu@VACNTs) were grown directly on Cu foil substrates of 0.1 mm thicknesses at different temperatures via plasma-enhanced chemical vapor deposition (PECVD). By circumventing the need for additional catalyst layers or intensive substrate treatments, our in-situ technique offers a simplified and potentially scalable route for fabricating Cu@VACNTs with enhanced electrical and thermal properties on thin Cu foils. Comprehensive analysis using field emission scanning microscopy (FESEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) mappings, and X-ray diffraction (XRD) revealed uniform Cu filling within the VACNTs across a range of synthesis temperatures (650 °C, 700 °C, and 760 °C). Field emission (FE) measurements of the sample synthesized at 700 °C (S700) showed low turn-on and threshold fields of 2.33 V/μm and 3.29 V/μm, respectively. The findings demonstrate the viability of thin Cu substrates in creating dense and highly conductive Cu-filled VACNT arrays for advanced electronic and nanoelectronics applications.

show abstract

“…S 2− ions originate from soluble inorganic sulfides such as Na 2 S or S-containing organics such as thiourea, dimethyl sulfoxide, and thioacetamide. The as-prepared CdS presents multifarious morphologies such as nanoparticles, [58,59] nanosheetsassembled microspheres, [60] hollow spheres, [61] nanorods, [62] and quantum dots. [63] Unfortunately, pristine CdS has low photocatalytic activity and stability which heavily restrict its application in the H 2 production field.…”

Section: D Cds-based S-scheme Photocatalystsmentioning

confidence: 99%

Construction of 2D S‐Scheme Heterojunction Photocatalyst

Zhu,

Sun,

Zhao

et al. 2023

Advanced Materials

View full text Add to dashboard Cite

Semiconductor photocatalytic technology holds immense promise for converting sustainable solar energy into chemically storable energy, with significant applications in the realms of energy and the environment. However, the inherent issue of rapid recombination of photogenerated electrons and holes hinders the performance of single photocatalysts. To overcome this challenge, the construction of 2D S‐scheme heterojunction photocatalysts emerges as an effective strategy. The deliberate design of dimensionality ensures a substantial interfacial area; while, the S‐scheme charge transfer mechanism facilitates efficient charge separation and maximizes redox capabilities. This review commences with a fresh perspective on the charge transfer mechanism in S‐scheme heterojunctions, followed by a comprehensive exploration of preparation methods and characterization techniques. Subsequently, the recent advancements in 2D S‐scheme heterojunction photocatalysts are summarized. Notably, the mechanism behind activity enhancement is elucidated. Finally, the prospects for the development of 2D S‐scheme photocatalysts are presented.

show abstract

Theoretical and experimental studies of nucleation and interface structure between carbon nanotubes and metals

Cited by 5 publications

References 36 publications

Dynamics of Electron Transfer in CdS Photocatalysts Decorated with Various Noble Metals

Dynamics of Electron Transfer in CdS Photocatalysts Decorated with Various Noble Metals

Field Emission Properties of Cu-Filled Vertically Aligned Carbon Nanotubes Grown Directly on Thin Cu Foils

Construction of 2D S‐Scheme Heterojunction Photocatalyst

Contact Info

Product

Resources

About