检索结果-南通市图书馆

Impedance hygrometer based on cellulose and CuPc

在线全文

学校读者我要写书评

暂无评论

Journal of semiconductors 2010年第6期31卷 70-73页

作者： kh.s.karimov T.A.Qasuria Zubair Ahmad Ghulam Ishaq khan Institute of Engineering sciences and Technology Physical Technical Institute Aini St.299/1Dushanbe

An investigation has been made on the properties of an impedance hygrometer fabricated using cellulose and copper phthalocyanine（Ag/cellulose/CuPc/Ag）.A 5wt%suspension of cellulose was prepared in water while the CuPc was dissolved in *** film was deposited on glass substrates with preliminary deposited metallic electrodes followed by deposition of CuPc *** resistances and capacitances of the samples were evaluated under the effect of *** impedance was calculated from resistance and capacitance *** was also measured during the *** was observed that the capacitance of the sensor increases and resistance and impedance decrease with an increase in the relative humidity *** was found that the impedance-humidity relationship showed more uniform changes in the interval of 31%—98%RH than the resistance-and capacitance-humidity relationships that showed visible changes in the humidity intervals of 31%-80%RH and 80%-98%RH *** humidity-dependent impedance of the sample makes it attractive for use in impedance *** impedance hygrometer may be used in instruments for the environmental monitoring of humidity.

关键词： cellulose copper phthalocyanine organic hygrometer humidity impedance

CuPc based organic-inorganic hetero-junction with Au electrodes

在线全文

学校读者我要写书评

暂无评论

Journal of semiconductors 2010年第7期31卷 22-25页

作者： Zubair Ahmad Muhammad H.sayyad kh.s.karimov Ghulam Ishaq khan Institute of Engineering sciences and Technology TopiNWFP23460Pakistan Department of Mechanical Engineering 20 Symond Street AucklandUniversity of AucklandNew Zealand

A hetero-junction of n-silicon（n-si） and copper phthalocyanine（CuPc） has been *** current -voltage characteristics were investigated to explain the rectification and conduction *** effect of temperature and humidity on the electrical properties of n-si/CuPc hetero-junction has also been *** characteristics of the junction have been observed to be temperature and humidity dependent,so it is suggested that this junction can be used as a temperature and humidity sensor.

关键词： inorganic-organic hetero-junction n-si CuPc

Electrical characterization of the organic semiconductor Ag/CuPc/Au schottky diode

在线全文

学校读者我要写书评

暂无评论

Journal of semiconductors 2011年第4期32卷 52-56页

作者： Mutabar shah M.H.sayyad kh.s.karimov Ghulam Ishaq khan Institute of Engineering sciences and Technology physical Technical Institute of Academy of sciences

This paper reports on the fabrication and investigation of a surface-type organic semiconductor copper phthalocyanine（CuPc） based diode.A thin film of CuPc of thickness 100 nm was thermally sublimed onto a glass substrate with preliminary deposited metallic electrodes to form a surface-type Ag/CuPc/Au schottky *** current-voltage characteristics were measured at room temperature under dark *** barrier height was calculated as 1.05 *** values of mobility and conductivity was found to be 1.74×10;cm;/（V·s） and 5.5×10;Ω;·cm;,*** low voltages the device showed ohmic conduction and the space charge limited current conduction mechanisms were dominated at higher voltages.

关键词： schottky diode copper phthalocyanine thin film organic semiconductor mobility

surface-type humidity sensor based on cellulose-PEPC for telemetry systems

在线全文

学校读者我要写书评

暂无评论

Journal of semiconductors 2011年第1期32卷 103-107页

作者： kh.s.karimov M.saleem T.A.Qasuria M.Farooq GIK Institute of Engineering sciences and Technology physical Technical Institute Aini St.299/1Dushanbe734063Tajikistan

Au/cellulose-PEPC/Au surface-type humidity sensors were fabricated by drop-casting cellulose and poly-N-epoxypropylcarbazole （PEPC） blend thin films. A blend of 2wt% of each cellulose and PEPC in benzol was used for the deposition of humidity sensing films. Blend films were deposited on glass substrates with preliminary deposited surface-type gold electrodes. Films of different thicknesses of cellulose and PEPC composite were deposited by drop-casting technique. A change in electrical resistance and capacitance of the fabricated devices was observed by increasing the relative humidity in the range of 0-95% RH. It was observed that the capacitances of the sensors increase, while their resistances decrease with increasing the relative humidity. The sensors were connected to op-amp square wave oscillators. It was observed that with increasing the relative humidity, the oscillator＇s frequencies were also increased in the range of 4.2-12.0 khz for 65μm thick film sample, 4.1-9.0 khz for 88μm thick film sample, and 4.2-9.0 khz for 210μm sample. Effects of film thickness on the oscillator＇s frequency with respect to humidity were also investigated. This polymer humidity sensor controlled oscillator can be used for short-range and long-range remote systems at environmental monitoring and assessment of the humidity level.

关键词： surface-type sensor: cellulose poly-N-epoxvoropylcarbazole humidity sensor controlled oscillator

Novel pressure and displacement sensors based on carbon nanotubes

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第1期24卷 560-563页

作者： kh.s.karimov khaulah sulaiman Zubair Ahmad khakim M.Akhmedov A.Mateen GIK Institute of Engineering sciences and Technology Topi District Swabi KPK 23640 Pakistan Physical Technical Institute of Academy of sciences Rudaki Ave. 33 Dushanbe 734025 Tajikistan Low Dimensional Materials Research Centre (LDMRC) Department of Physics Faculty of Science University of Malaya 50603 Kuala Lumpur Malaysia Center for Innovative Development of science and New Technologies of Academy of sciences Rudaki Ave. 33 Dushanbe 734025 Tajikistan Faculty of Materials science and Engineering Institute of Space Technology Islamabad 44000 Pakistan

We report newly designed pressure and displacement capacitive sensors based on a flexible paper–CNT *** carbon nanotube（CNT） powder was deposited on a thin paper substrate and was pressed at an elevated *** sheet resistance of the paper–CNT films was in the range of 2–4 kΩ/cm^2. The paper–CNT films were used to fabricate pressure and displacement sensors. The sensitivities of the pressure and the displacement sensors were found to be17.3 p F·m^2/k N and 0.93 10-3p F/μm, respectively. The experimental results were compared with the simulated data and they found good agreement with each other.

关键词： carbon nanotube sensors composite capacitance

Carbon nanotube cuprous oxide composite based pressure sensors

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第1期21卷 329-333页

作者： kh.s.karimov Muhammad Tariq saeed Chani Fazal Ahmad khalid Adam khan Rahim khan GIK Institute of Engineering sciences and Technology Topi 23640District SwabiPakistan Physical Technical Institute of Academy of sciences Rudaki Ave.33Dushanbe 734025Tajikistan

In this paper, we present the design, the fabrication, and the experimental results of carbon nanotube （CNT） and Cu20 composite based pressure sensors. The pressed tablets of the CNT Cu20 composite are fabricated at a pressure of 353 MPa. The diameters of the multiwalled nanotubes （MWNTs） are between 10 nm and 30 nm. The sizes of the Cu20 micro particles are in the range of 3-4 μm. The average diameter and the average thickness of the pressed tablets are 10 mm and 4.0 mm, respectively. In order to make low resistance electric contacts, the two sides of the pressed tablet are covered by silver pastes. The direct current resistance of the pressure sensor decreases by 3.3 times as the pressure increases up to 37 kN/m^2. The simulation result of the resistance-pressure relationship is in good agreement with the experimental result within a variation of ±2%.

关键词： carbon nanotubes Cu20 micro-powder pressure sensor simulation

Ag/PEPC/NiPc/ZnO/Ag thin film capacitive and resistive humidity sensors

在线全文

学校读者我要写书评

暂无评论

Journal of semiconductors 2010年第5期31卷 45-50页

作者： kh.s.karimov Kuan Yew Cheong M.saleem Imran Murtaza M.Farooq Ahmad Fauzi Mohd Noor GIK Institute of Engineering sciences and Technology TopiDistrict SwabiNWFP 23640Pakistan Physical Technical Institute of Academy of sciences Rudaki Ave 33Dushanbe734025Tajikistan school of Materials & Mineral Resources Engineering Engineering CampusUniversiti Sains Malaysia14300 Nibong TebalPenangMalaysia

A thin film of blended poly-N-epoxypropylcarbazole（PEPC）（25 wt.%）,nickel phthalocyanine（NiPc）（50 wt.%） and ZnO nano-powder（25 wt.%） in benzene（5 wt.%） was spin-coated on a glass substrate with silver electrodes to produce a surface-type Ag/PEPC/NiPc/ZnO/Ag capacitive and resistive *** with two different PEPC/NiPc/ZnO film thicknesses（330 and 400 nm） were fabricated and *** effects of humidity on capacitance and resistance of the Ag/PEPC/NiPc/ZnO/Ag sensors were investigated at two frequencies of the applied voltage：120 Hz and 1 *** was observed that at 120 Hz under humidity of up to 95%RH the capacitance of the sensors increased by 540 times and resistance decreased by 450 times with respect to humidity conditions of 50%RH. It was found that the sensor with a thinner semiconducting film（330 nm） was more sensitive than the sensor with a thicker film（400 nm）.The sensitivity was improved when the sensor was used at a lower frequency as compared with a high *** is assumed that the humidity response of the sensors is associated with absorption of water vapors and doping of water molecules in the semiconductor blend *** had been proven by simulation of the capacitance-humidity relationship.

关键词： organic semiconductor poly-N-epoxypropylcarbazole nickel phthalocyanine nano-powder ZnO sensor

Low temperature properties of organicinorganic Ag/p-CuPc/n-GaAs/Ag photoelectric sensor

在线全文

学校读者我要写书评

暂无评论

science China(Technological sciences) 2008年第2期51卷 153-161页

作者： kh. s. karimov I. QAZI T. A. khAN M. I. FEDOROV Physical Technical Institute of Academy of sciences GIK Institute of Engineering science and Technology state Technical University

A thin organic film of p-type semiconducting copper phthalocynanine (CuPc) was deposited by vacuum evaporation on an n-type GaAs single-crystal semiconductor substrate. The fabricated Ag/p-CuPc/n-GaAs/Ag sensor was carried through an ageing process to stabilize the parameters. Voltage-current characteristics and photoelectrical response of the sensor were investigated at a wide temperature range of 82 to 350 K. Photoelectric characteristics were measured under non-modulated filament-lamp illumination. It was observed that such sensor parameters as rectification ratio,threshold voltage,junction,shunt and series resistances,open-circuit voltage and short circuit current are temperature-dependent. It was found that wide-range voltage-current characteristics of the sensor may be de-scribed similarly to that of a schottky barrier diode. Using the experimental data on voltage-current characteristics and absorbance of the CuPc films,the energy-band diagram of the p-CuPc/n-GaAs heterojunction was developed. It was shown that data obtained from simulation of an equivalent circuit of photoelectric sensor agreed with experimental results.

关键词： organic solar cell organic-inorganic heterojunction temperature dependent I-V characteristics

Optical transmission in thin films of vanadium compounds

在线全文

学校读者我要写书评

暂无评论

Journal of semiconductors 2014年第7期35卷 10-14页

作者： kh.s.karimov M.Mahroof-Tahir M.saleem N.Ahmad A.Rashid GIK Institute of Engineering sciences and Technology TopiDistrict SwabiKPK 23640Pakistan Physical Technical Institute of Academy of sciences Rudaki Ave33Dushanbe 734025Tajikistan saint Cloud state University 720 Fourth Avenue SouthSaint CloudMN 56301-4498USA Government College of science Wahdat RoadLahore 54570Pakistan

Thin films of five vanadium compounds/composite：（1） VO2（3-fl）（3-fl = 3-Hydroxyflavone）, （2） VO（pbd）：（pbd = 1-Phenyl-l, 3-butadione）, （3） VO（dbm）2 （dbm = Dibenzoylmethane）, （4） VPc （Vanadyl Phthalocyanine） and （5） V2O5-PEPC （V2O5- poly-N-epoxypropylcarbazole composite）, were deposited by the dropcasting method from the solution in benzene. The transmittance-irradiance relationships were investigated and the transmission in the visible spectrum and optical images were obtained as well. It was found that the transmittance of the VO2（3-fl）, VO（pbd）2, VO（dbm）2 and VPc, was practically independent of the irradiance; whereas the transmittance of V2O5-PEPC decreased by 4% for thin and 9% for thick films with an increase of the irradiance.

关键词： vanadium compound/composite semiconductor thin film transmittance irradiance