ISSN:1057-9257    

DOI:10.1002/amo.860020302

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractSuitably modified bilayer lipid membranes (BLMs) offer exceptionally good opportunities for probing the electric field effects on charge transfer and redox reactions in biosensor and molecular electronics research and development. This work presents an attempt to form an ultrathin electron‐conducting matrix for a biosensing redox device on the basis of a BLM modified with tetracyano‐p‐quinodimethane (TCNQ), a well‐known compound forming charge transfer complexes of ‘organic metal’ behavior. The rationale behind the choice of membrane modifier was the reports of its unusual rectifying current–voltage characteristics when incorporated into BLMs alone or as part of an σ‐bridged donor–acceptor molecule of C16H33–Q3CNQ (Z‐β‐(1‐hexadecyl‐4‐quinolinium)‐α‐cyano‐4‐styryldicyano methanide) deposited

ISSN:1057-9257    

DOI:10.1002/amo.860020303

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractThe photoresponse of bacteriorhodopsin (bR) has been studied in Langmuir–Blodgett (LB) films bR was deposited by vertical dipping asx‐ orz‐type monolayers and asz‐type multi layers between stearic acid LB films. The electrodes used were a transparent vacuum‐deposited ITO on a quartz substrate and an InGa metal alloy. The signals were observed from samples containing a single bR layer or five bR layers both at room humidity and in water‐saturated conditions. The photoelectric signals ofx‐ andz‐type monolayers had opposite polarities and both had two exponential kinetics on a microsecond time scale with time constants of about 10 and 70 μs. The amplitude of the fast negative component of the signal of a bR monolayer was 0.4 mV, in the opposite direction to that in which protons were pumped. The amplitude due to five layers was five times as high as that due to a monolayer. The ratio between the amplitudes of the fast negative component and the slow positive part of the signal, in the proton‐pumping direction, was 1:3. The photoresponse signal saturated with a light intensity of about 1.7 mJ cm−2, which is equivalent to a photon density of 0.5 Å−2. The activation energy of the bR photovoltage was 75 ± 5 kJ mol−1in the temperature

ISSN:1057-9257    

DOI:10.1002/amo.860020304

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractResults are presented for the degree of crystallinity, determined by Raman spectroscopy, ofin situB‐doped LPCVD polysilicon as a function of deposition temperature. The results are compared with those reported in the literature for P‐doped polysilicon and it is found that for B doping full crystallinity of the layer is achieved at a significantly lower deposition temperature than is required for P doping. An attempt to understand this effect is made in terms of a quantitative model which allows an estimation of values for silicon self‐diffusivity and which is in accord with the experimental observa

ISSN:1057-9257    

DOI:10.1002/amo.860020305

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractVery interesting behaviour is shown by chemically deposited CdS thin films for optoelectronic applications after air and vacuum (10−5Torr) annealing. Vacuum annealing of samples at about 100°C caused the dark conductivity to improve by five orders of magnitude. The dark and photoconductivity of air‐annealed (at around 200°C) samples increased by seven and two orders of magnitude respectively. Air‐annealed (at 350°C for about 2 min) samples exhibited a very quick photoresponse (<2 s for two decades of photocurrent decay) with σp/σd≈ 105for a bias of 10 V, which may be exploited for photodetector applications. Air or vacuum annealing of samples for a minimum of 10–15 min caused the optical transmittance above the band edge to increase by 10%–15% and annealing the sample at 200°C caused the absorption edge to shift towards the longer‐wavelength region compared with the as‐prepared and 100 and

ISSN:1057-9257    

DOI:10.1002/amo.860020306

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractConductivity measurements demonstrate that in the presence of toluenesulphonic acid, 1:1 mixtures ofmesotetrakis(3,5‐di‐t‐butyl‐4‐hydroxyphenyl)porphyrin and its two‐electron oxidation product give materials whose degree of semiconductivity is dependent on the toluenesulphonic acid concentration i

ISSN:1057-9257    

DOI:10.1002/amo.860020307

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

ISSN:1057-9257    

DOI:10.1002/amo.860020309

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

ISSN:1057-9257    

DOI:10.1002/amo.860020310

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

ISSN:1057-9257    

DOI:10.1002/amo.860020311

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

ISSN:1057-9257    

DOI:10.1002/amo.860020312

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY