Rutile nanowire arrays: tunable surface densities, wettability and photochemistry

Zhou, Qiang; Yang, Xianfeng; Zhang, Shanqing; Han, Yaxiong; Ouyang, Gangfeng; He, Zhenhui; Liang, Chaolun; Wu, Mingmei; Zhao, Huijun

doi:10.1039/c1jm12690c

Cited by 15 publications

(9 citation statements)

References 50 publications

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“…Figure 6f) shows that NC clusters had effectively formed in these zones after the complete evaporation of water. These results prove that, in line with previous suggestions in the literature, 9,38 the penetration of water within the inter-NR space is the main factor controlling the NC formation in nanostructured surfaces. In addition, the angular perimeter depicted by the small droplets formed on the superhydrophobic surface sustains the fact that, even for small volumes and a limited penetration within the NR structure, water tends to reduce its surface tension by adjusting the drop shape to the NR structure.…”

Section: Resultssupporting

confidence: 93%

Following the Wetting of One-Dimensional Photoactive Surfaces

et al. 2012

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This article aims toward a full description of the wetting conversion from superhydrophobicity to superhydrophilicity under illumination with UV light of high-density ZnO nanorods surfaces by (i) following the evolution of the clusters and superstructures formed by the nanocarpet effect as a function of the water contact angle (WCA); (ii) characterization of the superhydrophobic and superhydrophilic states with an environmental scanning electron microscope (ESEM); and (iii) using the nanocarpet effect as a footprint of both local and apparent water contact angles. Thus, the main objective of the article is to provide a general vision of the wettability of 1D photoactive surfaces. In parallel, the nanocarpet (NC) formation by clustering of vertically aligned ZnO nanorods (NR) when water is dripped on their surface and then dried is studied for the first time by taking advantage of the possibility of tuning the surface water contact angle of the ZnO NR structure under UV preillumination. As a result, we demonstrate the feasibility of controlling the size and other morphological characteristics of the NCs. Moreover, a strong anisotropic wetting behavior, characterized by a Δθ = θ∥ – θ⊥ = 30°, is shown on an asymmetrically aligned NC surface resulting from arrays of tilted NRs. The study of the condensation/evaporation of water on/from an as-prepared (superhydrophobic) or a preilluminated (superhydrophilic) NR surface examined by an environmental scanning electron microscope has evidenced the formation of supported water droplets with polygonal shapes in the first case and the complete filling of the inter-NR space in the latter. The long-term stability of the NC clusters has been utilized as a footprint to track the penetration depth of water within the inter-NR space in the three borderline regions of water droplets. This analysis has shown that for moderately hydrophobic surfaces (i.e., water contact angles lower than 130°) water droplets do not present a well-defined borderline trace but a spreading region where water penetrates differently with the NR interspace. The transition from a Cassie–Baxter to a modified Cassie–Baxter to finish in a Wenzel wetting state is found on these surfaces depending on the UV preillumination time and is explained with a model where water interaction with the NR units is the critical factor determining the macroscopic wetting behavior of these surfaces.

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Section: Resultssupporting

confidence: 93%

Following the Wetting of One-Dimensional Photoactive Surfaces

et al. 2012

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“…0.64 and 0.32 V for rutile TiO 2 film and anatase TiO 2 nanotube film, respectively) can be ascribed to the limitation of the interfacial processes at the photocatalyst/electrolyte interface [33,34]. Moreover, an increase in the saturated photocurrent is also observed as the light intensity increases, due to the stronger light intensity leading to the generation of more charge carriers [32]. Our previous studies have demonstrated that the magnitude of I sph represents the maximum rate of water oxidation under a given light intensity [33,34].…”

Section: Photoelectrocatalytic Propertymentioning

confidence: 83%

Vapor-phase hydrothermal synthesis of rutile TiO2 nanostructured film with exposed pyramid-shaped (1 1 1) surface and superiorly photoelectrocatalytic performance

Chen

Zhang

Liu

et al. 2014

Journal of Colloid and Interface Science

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“…The route can continually supply titanium source from the Ti metal substrate for the growth of TiO 2 along one specific direction. 45,46 The crystal phase and growth direction of the sample obtained at 140 o C for 12 h (ANA12) by HF vapor oxidation over the aqueous solution of HF were investigated in details. The SEM image of the top view shows a smooth surface (Figure 1a).…”

Section: Synthesis Of Anatase Tio 2 Filmmentioning

confidence: 99%

Completely <001> oriented anatase TiO₂nanoarrays: topotactic growth and orientation-related efficient photocatalysis

Yang¹,

Wu²,

He³

et al. 2015

Nanoscale

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A TiO2 film has been facilely grown on a Ti foil via a general and simple acid vapor oxidation (AVO) strategy. Based on detailed characterization by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), we found that the TiO2 film was composed of anatase nanoarrays highly oriented along their <001> direction, resulting in a large exposed {001} top surface on the film. The growth mechanism based on a topotactic transformation was proposed according to a careful study of time-dependent experimental results. Resulting from the evaluation of photocatalytic performance compared with a commercial TiO2 photocatalyst (Degussa P25), the as-prepared oriented anatase TiO2 film showed higher efficiency for degradation of atrazine and acid orange II (AOII). The performance of photocatalysis is highly relevant to the preferential orientation. The efficient photocatalysis could be attributed to the highly reactive {001} facets on the anatase nanoarrays with super-hydrophilicity.

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Rutile nanowire arrays: tunable surface densities, wettability and photochemistry

Cited by 15 publications

References 50 publications

Following the Wetting of One-Dimensional Photoactive Surfaces

Following the Wetting of One-Dimensional Photoactive Surfaces

Vapor-phase hydrothermal synthesis of rutile TiO2 nanostructured film with exposed pyramid-shaped (1 1 1) surface and superiorly photoelectrocatalytic performance

Completely <001> oriented anatase TiO₂nanoarrays: topotactic growth and orientation-related efficient photocatalysis

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Rutile nanowire arrays: tunable surface densities, wettability and photochemistry

Cited by 15 publications

References 50 publications

Following the Wetting of One-Dimensional Photoactive Surfaces

Following the Wetting of One-Dimensional Photoactive Surfaces

Vapor-phase hydrothermal synthesis of rutile TiO2 nanostructured film with exposed pyramid-shaped (1 1 1) surface and superiorly photoelectrocatalytic performance

Completely <001> oriented anatase TiO2nanoarrays: topotactic growth and orientation-related efficient photocatalysis

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Completely <001> oriented anatase TiO₂nanoarrays: topotactic growth and orientation-related efficient photocatalysis