A simple route towards the reduction of surface conductivity in gas sensor devices

Samuel, Jorice; Ruther, Patrick; Frerichs, H.-P.; Lehmann, Mirko; Paul, Oliver; Rühe, Jürgen

doi:10.1016/j.snb.2005.01.032

Cited by 48 publications

(28 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Just to mention a few examples, wetting is important for self-cleaning, anti-icing, the adhesion of material surfaces, stiction issues in microelectromechanical systems (MEMS), Gecko's feet, 21 capillarity phenomena, reduced uid drug in micro/nanouidic systems etc. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Just to mention a few examples, wetting is important for self-cleaning, anti-icing, the adhesion of material surfaces, stiction issues in microelectromechanical systems (MEMS), Gecko's feet, 21 capillarity phenomena, reduced uid drug in micro/nanouidic systems etc.…”

Section: Introductionmentioning

confidence: 99%

Roughness controlled superhydrophobicity on single nanometer length scale with metal nanoparticles

et al. 2015

View full text Add to dashboard Cite

Here we demonstrate high water pinning nanostructures and trapping of water droplets onto surfaces via control of roughness on a single nanometer length-scale generated by deposition of preformed gas phase distinct copper nanoparticles on hydrophilic and hydrophobic surfaces. It was found that the contact angles of the water droplets were increased to the superhydrophobic limit $150 at high nanoparticle coverages ($80%) independent of the initial type of surface. The water droplets were trapped onto the surfaces by high adhesion forces similar like the rose petal effect. The droplets are in a Wenzel state at their outer part. Local nanocapillarity can force liquid into crevices between nanoparticles and push trapped air within the center of the droplet forming a Cassie-Baxter metastable state. Hence our approach to alter the wetting state is extremely straightforward without involving special micro/nano structuring facilities, but instead using direct single nanoparticles deposition on any type of surfaces creating a rough surface on a single nanometer length-scale, allowing due to its peculiar high water pinning and nanoporous structure liquid trapping phenomena.

show abstract

Section: Introductionmentioning

confidence: 99%

Roughness controlled superhydrophobicity on single nanometer length scale with metal nanoparticles

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The applications of superhydrophobic surfaces are diverse due to their unique water-repellency and self-cleaning abilities. The most common areas where superhydrophobic surfaces attract attention include anti-biofouling paints for boats [4], bio-chips [5], biomedical applications [6], microfluidics [7], corrosion resistance [8], eyeglasses, self-cleaning windshields for automobiles [9], stain resistant textiles [10], anti-sticking of snow for antennas and windows [11] and many others. In a recent review, we have demonstrated that superhydrophobic nanostructured surfaces may play an important role on anti-icing effects which may have diverse applications as coating on electric cables and insulators, aircraft wings, ship hulls, glass structures, windshields, etc.…”

Section: Introductionmentioning

confidence: 99%

One-step fabrication process of superhydrophobic green coatings

Sarkar

Noormohammed

2010

Surface and Coatings Technology

120

View full text Add to dashboard Cite

In general, creation of superhydrophobic surfaces is composed of two steps: (i) creation of a rough surface and (ii) passivation of the surface with the low surface energy molecules or coatings. Superhydrophobic properties cannot be achieved on a surface without these two essential factors fulfilled. In the present work we have demonstrated that superhydrophobic silver films on copper (Cu) substrates can be created in just a one-step process via galvanic reactions by immersing the Cu substrates in silver nitrate solution containing benzoic acid, simplifying the complexity of two different steps involved in the former method. Silver films were also fabricated using similar process without benzoic acid for comparative studies. The X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) confirmed the formation of benzoic acid incorporated silver films. Scanning electron microscopy (SEM) images showed micronano structured leaf-like and flower-like morphological features in the films prepared without and with benzoic acid, respectively. Benzoic acid incorporated flower-like silver films demonstrated water repellency as the water drops rolled off those surfaces whereas complete absorption of water drops were encountered on the leaf-like silver surfaces prepared without benzoic acid.

show abstract

“…Some agricultural applications were also discussed, such as antibiofouling paints for boats [19], bio-chips [20], biomédical applications [21], microfuidics [22], corrosion resistance [23], eyeglasses, self-cleaning windshields for automobiles [1], stain resistant textiles [24], antisticking of snow for antennas and windows [25], expected inhibition of adherence of snow, oxidation, current conduction [26] and many others. The following section includes how superhydrophobic coatings are used to improve the performance of some applications by surface modification.…”

Section: Applications Of Superhydrophobicitymentioning

confidence: 99%

Protection of metal and alloy surfaces using corrosion resistance nanostructured superhydrophobic coatings /

Huang¹

2012

View full text Add to dashboard Cite

Dans notre travail actuel, le processus de fabrication de surfaces de cuivre superhydrophobe est simplifié en une simple étape. L'application d'une tension continue entre deux plaques de cuivre immergé dans une solution diluée d'acide stéarique éthanolique transforme la surface de l'électrode de cuivre anodique en superhydrophobe due à la formation de micronano fibres de stéarate de cuivre à faible énergie de surface, tel que confirmé par rayons X diffraction (XRD) et microscopie électronique à balayage (MEB). L'augmentation du potentiel de modification, ainsi que la temps de modification conduit à l'augmentation de la valeur de la faible énergie de surface des micronanostructures ainsi que l'augmentation de la superhydrophobicité des surfaces telle que mesurée par l'angle de contact de l'eau. ABSTRACTSuperhydrophobic surfaces, which demonstrate high water-repellency, have recently become a very popular field because of its scientific and technological importance and wide range of applications in diverse areas. Preparation of nanostructured superhydrophobic surfaces requires both an optimum roughness and low surface energy; therefore, superhydrophobic surfaces are conventionally prepared employing two steps: roughening a surface and lowering its surface energy.In our present work, the fabrication process of superhydrophobic copper surfaces is simplified as just one-step. The application of a direct voltage between two copper plates immersed in a dilute ethanolic stearic acid solution transforms the surface of the anodic copper electrode to superhydrophobic due to the formation of micro-nanofibors low surface energy follower-like copper stéarate as confirmed by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The increase of the modification potential as well as the modification time leads to the increase of the amount of the low surface energy micro-nanostructures as well as the increase of the superhydrophobicity of the surfaces as measured by water contact angle.The nanostructured superhydrophobic aluminum alloy surfaces have also been prepared by the similar procedure as it was performed on copper surfaces. However, stearic acid modified aluminum alloy surfaces didn't show the superhydrophobic properties. Therefore, the aluminum surfaces were firstly coated with copper films followed by electrochemical modification with stearic acid solution. The copper grows as microdots on AA6061 Al alloy surfaces. The surface densities of the microdots increase with the increase of the negative deposition potentials. On the other hand their sizes as well as the distances between the microdots reduce with the increase of the negative deposition potentials. The surface roughness and water contact angle of electrodeposited copper film followed by electrochemical modification in ethanolic stearic acid solution increase with the increase in negative copper deposition potentials. The stearic acid modified copper films deposited at -0.6 V provides a surface roughness of 6.2 /un with a water contact a...

show abstract

A simple route towards the reduction of surface conductivity in gas sensor devices

Cited by 48 publications

References 19 publications

Roughness controlled superhydrophobicity on single nanometer length scale with metal nanoparticles

Roughness controlled superhydrophobicity on single nanometer length scale with metal nanoparticles

One-step fabrication process of superhydrophobic green coatings

Protection of metal and alloy surfaces using corrosion resistance nanostructured superhydrophobic coatings /

Contact Info

Product

Resources

About