Janusz Smulko - Publikacje - MOST Wiedzy

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Zdjęcie profilowe: prof. dr hab. inż. Janusz Smulko

prof. dr hab. inż. Janusz Smulko

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wszystkich: 156

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Katalog Publikacji

2020
  • Advanced Nanomaterials for Inexpensive Gas Microsensors - Synthesis, Integration and Applications
    Publikacja

    - 2020

    Advanced Nanomaterials for Inexpensive Gas Microsensors: Synthesis, Integration and Applications presents full coverage in the area of gas sensing nanomaterials, from materials, transducers and applications, to the latest results and future direction. Experts present work on metal oxides, carbon-based and hybrid materials, fabrication and application. The book brings together three major themes, including synthesis, functionalization...

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  • Advanced operating methods
    Publikacja

    - 2020

    Selected operating methods of resistive gas sensors were presented. The methods utilize flicker noise (1/f noise), which gives additional information about ambient gas when compared with the recorded changes of DC resistance only. Methods of flicker noise measurements were outlined. Recently developed prototype gas sensors comprising golden nanoparticle functionalized with organic ligands can generate intense flicker noise induced...

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  • Analysis of Vibration and Acoustic Signals for Noncontact Measurement of Engine Rotation Speed
    Publikacja
    • S. Xuansheng
    • T. Lu
    • H. Wen
    • R. Martinek
    • J. Smulko

    - SENSORS - 2020

    The non-contact measurement of engine speed can be realized by analyzing engine vibration frequency. However, the vibration signal is distorted by harmonics and noise in the measurement. This paper presents a novel method for the measurement of engine rotation speed by using the cross-correlation of vibration and acoustic signals. This method can enhance the same frequency components in engine vibration and acoustic signal. After...

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2019
2018
2017
  • Assessment of Supercapacitor’s Quality by Means of Low Frequency Noise
    Publikacja

    Low frequency noise is a well-known tool for quality and reliability assessment of electronic devices. This phenomenon is observed in different electrochemical devices as well (e.g., smart windows, electrochemical corrosion processes). Thus, we can assume that the same tool can be used to asses quality of supercapacitors. Their quality is usually determined only by capacitance and/or equivalent series resistance (ESR), or impedance....

  • Corrosion process monitoring by AFM higher harmonic imaging

    The atomic force microscope (AFM) was invented in 1986 as an alternative to the scanning tunnelling microscope, which cannot be used in studies of non-conductive materials. Today the AFM is a powerful, versatile and fundamental tool for visualizing and studying the morphology of material surfaces. Moreover, additional information for some materials can be recovered by analysing the AFM's higher cantilever modes when the cantilever...

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  • Feasibility study of a Raman spectroscopic route to drug detection
    Publikacja

    - 2017

    We present an surface-enhanced Raman spectroscopy (SERS) approach for detection of drugs of abuse in whole human blood. We utilize a near infrared laser with 830 nm excitation wavelength in order to reduce the influence of fluorescence on the spectra of blood. However, regular plasmon resonance peak of plasmonic nanoparticles, such as silver or gold fall in a much lower wavelength regime about 400 nm. Therefore, we have shifted...

  • Fluctuation-enhanced and conductometric gas sensing with nanocrystalline NiO thin films: A comparison
    Publikacja
    • U. Cindemir
    • M. Trawka
    • J. Smulko
    • C. Granqvist
    • L. Österlund
    • G. Niklasson

    - SENSORS AND ACTUATORS B-CHEMICAL - 2017

    Nanocrystalline thin films of NiO were prepared by advanced reactive gas deposition, and their responses to formaldehyde, ethanol and methane gases were studied via fluctuation-enhanced and conductometric methods Thin films with thicknesses in the 200–1700-nm range were investigated in as-deposited form and after annealing at 400 and 500 °C. Morphological and structural analyses showed porous deposits with NiO nanocrystals having...

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  • Measurements of flicker noise in supercapacitor cells
    Publikacja

    - 2017

    Flicker noise (1/f-like noise) is often used to assess the quality of various materials and devices. This phenomenon has been observed in different electrochemical devices or reactions (e.g., smart windows, pitting corrosion events). In our exploratory studies we consider how to measure and utilize 1/f noise for the quality assessment of supercapacitors. This task requires special attention because of enormous capacitance of the...

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  • Noise sources in Raman spectroscopy of biological objects
    Publikacja

    We present an overview of noise sources deteriorating the quality of the recorded biological Raman spectra and the ability to determine the specimen composition. The acquired Raman spectra exhibit intense additive noise components or drifts because of low intensity of the scattered light. Therefore we have to apply expensive or bulky measurement setups to limit their inherent noise or to apply additional signal processing to reduce...

  • Non-Gaussian Resistance Fluctuations in Gold-Nanoparticle-Based Gas Sensors: An Appraisal of Different Evaluation Techniques
    Publikacja

    - SENSORS - 2017

    Volatile organic compounds, such as formaldehyde, can be used as biomarkers in human exhaled breath in order to non-invasively detect various diseases, and the same compounds are of much interest also in the context of environmental monitoring and protection. Here, we report on a recently-developed gas sensor, based on surface-functionalized gold nanoparticles, which is able to generate voltage noise with a distinctly non-Gaussian...

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2016
2015
2014
  • Anatomy of noise in quantitative biological Raman spectroscopy
    Publikacja
    • J. Smulko
    • N. Chari Dingari
    • J. Soares
    • I. Barman

    - BIOANALYSIS - 2014

    Raman spectroscopy is a fundamental form of molecular spectroscopy that is widely used to investigate structures and properties of molecules using their vibrational transitions. It relies on inelastic scattering of monochromatic laser light irradiating the specimen. After appropriate filtering the scattered light is dispersed onto a detector to determine the shift from the excitation wavelength, which appears in the form of...

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  • AUTOMATED SYSTEM FOR FLUCTUATION ENHANCED GAS SENSING

    Resistance gas sensors exhibit random phenomena (resistance noise) which can be utilized to improve gas sensitivity and selectivity. That new emerging technique has to be investigated to recognize optimal parameters for gas detection. It means that a measurement system has to have ability of numerous parameters adjustment (e.g., sampling frequency, heater voltage, polarization current, voltage noise amplification). That fact induced...

  • Detection of Denatonium Benzoate (Bitrex) Remnants in Noncommercial Alcoholic Beverages by Raman Spectroscopy
    Publikacja

    - JOURNAL OF FORENSIC SCIENCES - 2014

    Illegal alcoholic beverages are often introduced into market using cheap technical alcohol, which is contaminated by denatonium benzoate (Bitrex) of very small concentration. Bitrex is the most bitter chemical compound and has to be removed before alcohol consumption. The home-made methods utilize sodium hypochlorite to disintegrate particles of denatonium benzoate in alcohol and to remove bitter taste before trading. In this experimental...

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  • Efficiency of gas mixtures detection by resistive gas sensors
    Publikacja

    Resistive gas sensors are very popular and are commonly used to detect various gases and their mixtures. Theeir main disadvantage is very limited selectivity. Practical use of gas sensors in environenmental applications requires determination of concentration of a few mixed gases at the same time. We would like to present recent results of gas detection improvement by utilizing a single gas sensor and additional measurements to...

  • EFFICIENCY OF GAS MIXTURES DETECTION BY RESISTIVE GAS SENSORS
    Publikacja

    Resistive gas sensors are very popular and are commonly used to detect various gases and their mixtures. Their main disadvantage is very limited selectivity. Practical use of gas sensors in environmental applications (e.g., in sewage systems to protect workers, in air conditioning systems to monitor atmosphere quality) requires determination of concentration of a few mixed gases at the same time. We would like to present recent...

  • Fluctuation enhanced gas sensing using UV irradiated Au-nanoparticle-decorated WO3-nanowire films
    Publikacja
    • M. Trawka
    • J. Smulko
    • L. Hasse
    • C. Granqvist
    • R. Ionescu
    • F. Annanouch
    • E. Llobet
    • L. Kish

    - 2014

    WO3 nanowires (WO3-NWs) decorated with gold nanoparticles (AuNPs) were utilized in resistive gas sensor devices to detect ethanol by use of fluctuation enhanced sensing (FES). The experimental system records both DC resistance and fluctuations of the sensing film. Our data verify that the sensitivity and selectivity of the gas sensor are improved by applying FES when the sensor is stimulated with a combination of UV light and heating....

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  • New approaches for improving selectivity and sensitivity of resistive gas sensors: A review
    Publikacja
    • J. Smulko
    • M. Trawka
    • L. Hasse
    • C. Granqvist
    • R. Ionescu
    • F. Annanouch
    • E. Llobet
    • L. Kish

    - 2014

    Resistive gas sensors are very popular and reliable but suffer from low selectivity and sensitivity. Various methods have been suggested to improve both features without increasing the number of sensors in gas detection systems. Fluctuation enhanced gas sensing was proposed to improve gas detection efficiency by analyzing low-frequency resistance fluctuations, and noise parameters can be more informative than the single DC resistance...

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  • Performance Analysis of the "Intelligent" Kirchhoff- Law - Johnson-Noise Secure Key Exchange

    The Kirchhoff-law - Johnson-noise (KLJN) secure key distribution system provides a way of exchanging theoretically secure keys by measuring random voltage and current through the wire connecting two different resistors at Alice’s and Bob’s ends. Recently new advanced protocols for the KLJN method have been proposed with enhanced performance. In this paper, we analyze the KLJN system and compare with the „intelligent” KLJN (iKLJN)...

  • Quality assessment of ZnO-based varistors by 1/f noise

    Noise has been used as a diagnostic tool of surge arrester varistor structures comprising of ZnO grains of various type and size. The physical and electrical properties of the measured samples have been described. In the experimental study, the applied measurement system and the results of noise measurements for the selected structures of varistors designed for the continuous working voltage 280 V, 440 V and 660 V have been presented....

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wyświetlono 2075 razy