Effect of humidity on electrical conductivity of zinc stearate nanofilms

被引：20

作者：

Ozturk, Serdar

Balkose, Devrim

Okur, Salih

Umemura, Junzo

机构：

[1] Izmir Inst Technol, Fac Sci, Dept Phys, Izmir 35430, Turkey

[2] Izmir Inst Technol, Dept Chem Engn, Izmir 35430, Turkey

[3] Chinese Acad Sci, Changchun Inst Appl Chem, Changchun 130022, Peoples R China

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2007年 / 302卷 / 1-3期

关键词：

zinc stearate; Langmuir-Blodgett films; electrical conductivity; humidity effect;

D O I：

10.1016/j.colsurfa.2007.01.039

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work, stearic acid (StAc) and zinc stearate (ZnSt(2)) nanofilms were deposited on glass and silver substrates using Langmuir-Blodgett (LB) film technique and their structural and electrical properties were investigated. X-ray diffraction and IR techniques revealed that more crystalline and better films were obtained from ZnSt2 compare to StAc. Electrical conductivity of ZnSt2 LB films with 13 layers having 28 nm thickness were measured in the range of humidity of 20-60% and it is seen that the conductivity was very sensitive to relative humidity (RH) above 40% at 25 degrees C and showed no hysteresis during adsorption and desorption of water vapor. Water vapor adsorption isotherm of ZnSt2 powders was determined and conductivity increase with humidity was attributed to water vapor adsorption. Constant electrical conductivity of the ZnSt2 films at low relative humidities and at low voltage values is an advantageous property which allows using them as organic nanofilms with insulating properties. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：67 / 74

页数：8

共 22 条

[1] 2D-3D transformations of amphiphilic monolayers influenced by intermolecular interactions: A Brewster angle microscopy study [J].

Angelova, A ;

Vollhardt, D ;

Ionov, R .

JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (25) :10710-10720

[2] IN-SITU CHARACTERIZATION OF LANGMUIR-BLODGETT-FILMS DURING A TRANSFER PROCESS - EVALUATION OF TRANSFER RATIO AND WATER INCORPORATION BY USING A QUARTZ-CRYSTAL MICROBALANCE [J].

ARIGA, K ;

OKAHATA, Y .

LANGMUIR, 1994, 10 (09) :3255-3259

[3] Stability and collapse of monolayers of stearic acid and the effect of electrolytes in the subphase [J].

Avila, LVN ;

Saraiva, SM ;

Oliveira, JF .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1999, 154 (1-2) :209-217

[4] Water sorption characteristics of six row barley malt (Hordeum vulgare) [J].

Barreiro, JA ;

Fernández, S ;

Sandoval, AJ .

LEBENSMITTEL-WISSENSCHAFT UND-TECHNOLOGIE-FOOD SCIENCE AND TECHNOLOGY, 2003, 36 (01) :37-42

[5] Preparation and characterization of composite LB films of lignin and cadmium stearate [J].

Constantino, CJL ;

Dhanabalan, A ;

Curvelo, A ;

Oliveira, ON .

THIN SOLID FILMS, 1998, 327 :47-51

[6] Variation of monolayer behaviour and molecular packing in zinc arachidate LB films with subphase pH [J].

Dhanabalan, A ;

Kumar, NP ;

Major, S ;

Talwar, SS .

THIN SOLID FILMS, 1998, 327 :787-791

[7] IMAGING NANOMETER SCALE DEFECTS IN LANGMUIR-BLODGETT-FILMS WITH THE ATOMIC FORCE MICROSCOPE [J].

HANSMA, HG ;

GOULD, SAC ;

HANSMA, PK ;

GAUB, HE ;

LONGO, ML ;

ZASADZINSKI, JAN .

LANGMUIR, 1991, 7 (06) :1051-1054

[8] COMPOSITION AND TRANSFER MECHANISM OF LANGMUIR-BLODGETT MULTILAYERS OF STEARATES [J].

HASMONAY, H ;

VINCENT, M ;

DUPEYRAT, M .

THIN SOLID FILMS, 1980, 68 (01) :21-31

[9] INFRARED SPECTROSCOPIC EVIDENCE FOR COEXISTENCE OF 2 MOLECULAR CONFIGURATIONS IN CRYSTALLINE FATTY-ACIDS [J].

HAYASHI, S ;

UMEMURA, J .

JOURNAL OF CHEMICAL PHYSICS, 1975, 63 (05) :1732-1740

[10] Vibrational spectra and structures of zinc carboxylates II. Anhydrous zinc acetate and zinc stearate [J].

Ishioka, T ;

Shibata, Y ;

Takahashi, M ;

Kanesaka, I .

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 1998, 54 (12) :1811-1818

← 1 2 3 →