The wide variety of molecular architectures used in sensors and biosensors and the large amount of data generated with some principles of detection have motivated the use of computational methods, such as information visualization techniques, not only to handle the data but also to optimize sensing performance. In this study, we combine projection techniques with micro-Raman scattering and atomic force microscopy (AFM) to address critical issues related to practical applications of electronic tongues (e-tongues) based on impedance spectroscopy. Experimentally, we used sensing units made with thin films of a perylene derivative (AzoPTCD acronym), coating Pt interdigitated electrodes, to detect CuCl(2) (Cu(2+)), methylene blue (MB), and saccharose in aqueous solutions, which were selected due to their distinct molecular sizes and ionic character in solution. The AzoPTCD films were deposited from monolayers to 120 nm via Langmuir-Blodgett (LB) and physical vapor deposition (PVD) techniques. Because the main aspects investigated were how the interdigitated electrodes are coated by thin films (architecture on e-tongue) and the film thickness, we decided to employ the same material for all sensing units. The capacitance data were projected into a 2D plot using the force scheme method, from which we could infer that at low analyte concentrations the electrical response of the units was determined by the film thickness. Concentrations at 10 μM or higher could be distinguished with thinner films--tens of nanometers at most--which could withstand the impedance measurements, and without causing significant changes in the Raman signal for the AzoPTCD film-forming molecules. The sensitivity to the analytes appears to be related to adsorption on the film surface, as inferred from Raman spectroscopy data using MB as analyte and from the multidimensional projections. The analysis of the results presented may serve as a new route to select materials and molecular architectures for novel sensors and biosensors, in addition to suggesting ways to unravel the mechanisms behind the high sensitivity obtained in various sensors.

Toward the Optimization of an e-Tongue System Using Information Visualization: A Case Study with Perylene Tetracarboxylic Derivative Films in the Sensing Units

This paper reports the fabrication of Ag/N-BuHHPDI/p-Si heterojunction diode by evaporating a layer of organic compound N-Butyl-N'-(6-hydroxyhexyl) perylene-3,4,9,10-tetracarboxylicacid-diimide (N-BuHHPDI) on top of the p-Si. The electronic properties of the heterojunction have been studied, in dark at a temperature of 300 K, by conventional current–voltage (I–V) method, Norde's method and Cheung's technique. By analyzing conventional I–V characteristics, the device exhibited rectifying behavior with a rectification ratio of 62.67 at ± 5.8 V. From the forward biased I–V measurements, the barrier height and ideality factor values of 0.83 eV and 6.4, respectively, have been obtained. Different diode parameters such as series resistance, shunt resistance, reverse saturation current and turn on voltage have been extracted from the I–V measurements. The parameters calculated from Norde's and Cheung's methods are found to be in good agreement with those calculated from conventional I–V measurements. Morphology of the N-BuHHPDI film is investigated using atomic force microscope (AFM).

THE ELECTRICAL CHARACTERIZATION OF Ag/N-BuHHPDI/p-Si HETEROJUNCTION BY CURRENT–VOLTAGE CHARACTERISTICS

We report a pump-probe study of the two-photon induced reflectivity changes in bis (n-butylimido) perylene thin films. To enhance the two-photon excitation we deposited bis (n-butylimido) perylene films on top of gold nanoislands. The observed transient response in the reflectivity spectrum of bis (n-butylimido) perylene is due to a depletion of the molecule’s ground state and excited state absorption.

Ultrafast dynamics of bis ( n -butylimido) perylene thin films excited by two-photon absorption

Perylene nanostructured films optimization for organic electronics: molecular, structural, and electrochemical characterization

Filmes nanoestruturados aplicados ao sistema de língua eletrônica: um estudo de interfaces

Nous reportons les isothermes pression de surface - aire moleculaire (π-A) pour les monocouches Langmuir de quatre derives perylenetetracarboxylique (PTCD), ainsi que les differentes temperatures de sous phase et les vitesses de compression mesurees. Le comportement de ces derives PTCD a l'interface eau-air est modelise par la methode d'arrimage rigide. Cette approche est la premiere tentative pour comparer la modelisation de l'orientation moleculaire de PTCD a la surface de l'eau avec les isothermes experimentales Langmuir Cette methodologie pourrait permettre d'anticiper l'agregation et de determiner si des orientations spatiales favorables des perylenes sont generees a la surface de l'eau. Les experiences avec les isothermes π-A montrent que ces molecules peuvent supporter des pressions de surface elevees ce qui indique un arrangement solide a la surface de l'eau et que les isothermes sont independantes de la vitesse de compression mais dependantes de la temperature. L'orientation moleculaire et l'empilement ont ete examines dans des monocouches Langmuir-Blodgett (LB) deposees sur du verre et sur du verre recouvert de films isoles de Ag en utilisant de mesures en absorption UV-visible et fluorescence avec surface accrue (SEF).

Surface pressure-area isotherms for Langmuir monolayers and a docking molecular orientation of perylene tetracarboxylic derivatives on a water surface

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

I. Caracelli

Author Tools

Chat about Author

Papers

Surface pressure-area isotherms for Langmuir monolayers and a docking molecular orientation of perylene tetracarboxylic derivatives on a water surface