Comparative studies of doped and surface modified tin oxide towards hydrogen sensing: Synergistic effects of Pd and Ru

被引：38

作者：

Chaudhary, VA ^{[1
]}

Mulla, IS ^{[1
]}

Vijayamohanan, K ^{[1
]}

机构：

[1] Natl Chem Lab, Div Phys & Mat Chem, Pune 411008, Maharashtra, India

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1998年 / 50卷 / 01期

关键词：

surface modification; tin oxide hydrogen sensor; synergism;

D O I：

10.1016/S0925-4005(98)00155-5

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A surface functionalised gas sensing material capable of giving better sensitivity and selectivity to hydrogen is demonstrated by grafting few Ru-O and Pd-O linkages in the surface of tin oxide. A systematic evaluation of the surface coverage, morphology and thermal stability using different techniques like EDAX, Cyclic voltammetry, SEM and TGA indicates the importance of an optimum distribution of Ru/Pd ratio (1.28) in dictating both sensitivity and selectivity. A comparison of the optimum performance of conventionally doped (225) and surface modified (1350) tin oxide to 1000 ppm hydrogen at 250 degrees C illustrates the clear advantages offered by surface modified tin oxide in enhancing the sensitivity. Moreover, the synergistic effect by surface functionalisation with both Ru and Pd species is emphasised in comparison to individually modified tin oxide sensors. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：45 / 51

页数：7

共 16 条

[1]

Ansari SG, 1996, J MATER SCI-MATER EL, V7, P267

[2]

BARRET EPS, 1996, SENSOR ACTUAT B-CHEM, V1, P116

[3] Room-temperature hydrogen sensors based on ZnO [J].

Basu, S ;

Dutta, A .

MATERIALS CHEMISTRY AND PHYSICS, 1997, 47 (01) :93-96

[4] Synergistic sensitivity effects in surface-modified tin oxide hydrogen sensors using ruthenium and palladium oxides [J].

Chaudhary, VA ;

Mulla, LS ;

Vijayamohanan, K .

JOURNAL OF MATERIALS SCIENCE LETTERS, 1997, 16 (22) :1819-1821

[5] THE EFFECT OF OXYGEN PARTIAL-PRESSURE ON THE RESPONSE OF TIN (IV) OXIDE BASED GAS SENSORS [J].

COLES, GSV ;

WILLIAMS, G ;

SMITH, B .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1991, 24 (04) :633-641

[6]

HAN Z, 1987, YIBIAO CAILIAO, V18, P59

[7]

HIROKAZU S, 1988, DENKI OYOBI KAGYO BA, V56, P453

[8] THICK-FILM HYDROCARBON-GAS SENSORS [J].

LEE, DD ;

CHOI, DH .

SENSORS AND ACTUATORS B-CHEMICAL, 1990, 1 (1-6) :231-235

[9] Microstructure evolution and gas sensitivities of Pd-doped SnO2-based sensor prepared by three different catalyst-addition processes [J].

Lim, CB ;

Oh, S .

SENSORS AND ACTUATORS B-CHEMICAL, 1996, 30 (03) :223-231

[10] Humidity-sensing behaviour of surface-modified zirconia [J].

Mulla, IS ;

Pradhan, SD ;

Vijayamohanan, K .

SENSORS AND ACTUATORS A-PHYSICAL, 1996, 57 (03) :217-221

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