Imogolite as an electron emitter and a water sensor

Oh, Jihyun; Chang, Sunyoung; Jang, Ji-Young; Roh, Seungkwang; Park, Jaehong; Lee, Jungwoo; Sohn, Daewon; Yi, Whikun; Jung, YunJae; Kim, Sung Jin

doi:10.1007/s10854-007-9125-8

Cited by 8 publications

(9 citation statements)

References 13 publications

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“…The tube walls consist of curved gibbsite-like sheets with SiOH groups on the inside and AlOH groups on the outside. According to our previous results, 2 imogolite behaved like an insulator under vacuum. Upon the adsorption of several gases and organic compounds such as O 2 , N 2 , Ar, benzene, ethanol and pyridine, current flow through imogolite was not observed.…”

Section: Introductionsupporting

confidence: 64%

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Current-voltage Characteristics of Water-adsorbed Imogolite Film

2008

Bulletin of the Korean Chemical Society

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Electric current flow was observed through imogolite film when imogolite ((HO)3Al2O3SiOH) was exposed to water molecules and connected to external electrodes. Current flow was due to the bound water on the surface of imogolite. Current flow increased as the pH of the water decreased. The current-voltage (I-V) measurements from a field effective transistor (FET) using H2O/imogolite film revealed that the current carrier in H2O/ imogolite had p-type characteristics, i.e. the carrier was probably H + . The possible mechanism for current transportation in imogolite/water was also suggested in this paper.

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Section: Introductionsupporting

confidence: 64%

“…However, when imogolite was exposed to water molecules inside a vacuum chamber, current flow was observed as reported in our previous report. 2 It was believed that current passes through the water molecules adsorbed on imgolite surface.…”

Section: Methodsmentioning

confidence: 99%

Current-voltage Characteristics of Water-adsorbed Imogolite Film

2008

Bulletin of the Korean Chemical Society

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“…The ability to generate sufficient electric field and emit electrons at the tip of the carbon nanotube is believed to be due to its high aspect ratio and geometry [ 108 ]. It is intriguing to think that imogolite, which shares similar geometry and tubular structure with carbon nanotube, may also be a good electron emitter as well.…”

Section: Multilayered Composite Film Composed Of Water-soluble Conmentioning

confidence: 99%

Imogolite Reinforced Nanocomposites: Multifaceted Green Materials

et al. 2010

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This paper presents an overview on recent developments of imogolite reinforced nanocomposites, including fundamental structure, synthesis/purification of imogolite, physicochemical properties of nanocomposites and potential applications in industry. The naturally derived nanotubular material of imogolite represents a distinctive class of nanofiller for industrially significant polymer. The incompatibility between the surface properties of inorganic nanofiller and organic matrix has prompted the need to surface modify the imogolite. Early problems in increasing the binding properties of surface modifier to imogolite have been overcome by using a phosphonic acid group. Different approaches have been used to gain better control over the dispersal of nanofiller and to further improve the physicochemical properties of nanocomposites. Among these, polymer grafting, in situ synthesis of imogolite in polymer matrix, and spin-assembly are some of the promising methods that will be described herein. This imogolite reinforced nanocomposite of enhanced optical and mechanical properties, and with unique biological and electronic properties, is expected to become an important category of hybrid material that shows potential for industrial applications.

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“…It was speculated that the current flow was due to charge hopping on the hydrated imogolite surface. Oh et al studied the I – V characteristics of imogolite and proposed that bound water molecules contribute to the surface conductivity [69–70]. The current flow observed was attributed to the ability of OH groups on the imogolite surface to lose or gain positive charge (a proton) from water molecules resulting in a net change of surface charge.…”

Section: Reviewmentioning

confidence: 99%

Surface functionalization of aluminosilicate nanotubes with organic molecules

Ma¹,

Yah²,

Otsuka³

et al. 2012

Beilstein J. Nanotechnol.

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SummaryThe surface functionalization of inorganic nanostructures is an effective approach for enriching the potential applications of existing nanomaterials. Inorganic nanotubes attract great research interest due to their one-dimensional structure and reactive surfaces. In this review paper, recent developments in surface functionalization of an aluminosilicate nanotube, “imogolite”, are introduced. The functionalization processes are based on the robust affinity between phosphate groups of organic molecules and the aluminol (AlOH) surface of imogolite nanotubes. An aqueous modification process employing a water soluble ammonium salt of alkyl phosphate led to chemisorption of molecules on imogolite at the nanotube level. Polymer-chain-grafted imogolite nanotubes were prepared through surface-initiated polymerization. In addition, the assembly of conjugated molecules, 2-(5’’-hexyl-2,2’:5’,2’’-terthiophen-5-yl)ethylphosphonic acid (HT3P) and 2-(5’’-hexyl-2,2’:5’,2’’-terthiophen-5-yl)ethylphosphonic acid 1,1-dioxide (HT3OP), on the imogolite nanotube surface was achieved by introducing a phosphonic acid group to the corresponding molecules. The optical and photophysical properties of these conjugated-molecule-decorated imogolite nanotubes were characterized. Moreover, poly(3-hexylthiophene) (P3HT) chains were further hybridized with HT3P modified imogolite to form a nanofiber hybrid.

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Imogolite as an electron emitter and a water sensor

Cited by 8 publications

References 13 publications

Current-voltage Characteristics of Water-adsorbed Imogolite Film

Current-voltage Characteristics of Water-adsorbed Imogolite Film

Imogolite Reinforced Nanocomposites: Multifaceted Green Materials

Surface functionalization of aluminosilicate nanotubes with organic molecules

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