Enhanced Biomimetic Sensor for Cigarette Brand Differentiation using CdSe Quantum Dots and Machine Learning DOI Creative Commons

Arsala Zamir Khan,

Shalini Sharma, Tauseef Ahmad Ansari

и другие.

Research Square (Research Square), Год журнала: 2023, Номер unknown

Опубликована: Дек. 29, 2023

Abstract In our doctoral research, we ex- plored the combined influence of CdSe Quantum Dots (QDs) and reactions organic substances to create an olfactory-inspired sensing system based on mammalian olfactory framework. Our primary aim was identify complex composition volatile com- pounds (VOCs) found in cigarette smoke. We designed innovative optical olfaction device categorize various VOCs emitted by cigarettes. utilized advanced techniques like Unsupervised Independent Compo- nent Analysis (ICA) supervised Linear Discriminant (LDA) for robust data analysis. The LDA yielded remarkable results, with 100% precision both training cross-validation phases. To validate system, rigorously assessed its ability distinguish between five different brands, achieving im- pressive 85% during cross-validation. Using LDA, also conducted a comprehensive analysis 100 sam- ples four popular Indian brands (Gold Fake, Four Square, Navy Cut, ITC Classic), including authentic counterfeit variants, resulting commendable 97% accuracy. analytical protocol is efficient, cost-effective, user-friendly, highly reliable. selectivity sensor array makes it indispensable detecting genuine cigarettes, providing crucial support global border control efforts.

Язык: Английский

Colloidal Quantum Dots for Explosive Detection: Trends and Perspectives DOI Creative Commons
Andrea De Iacovo, Federica Mitri, Serena De Santis

и другие.

ACS Sensors, Год журнала: 2024, Номер 9(2), С. 555 - 576

Опубликована: Фев. 2, 2024

Sensitive, accurate, and reliable detection of explosives has become one the major needs for international security environmental protection. Colloidal quantum dots, because their unique chemical, optical, electrical properties, as well easy synthesis route functionalization, have demonstrated high potential to meet requirements development suitable sensors, boosting research in field explosive detection. Here, we critically review most relevant works, highlighting three different mechanisms based on colloidal namely photoluminescence, electrochemical, chemoresistive sensing. We provide a comprehensive overview an extensive discussion comparison terms sensor parameters. highlight advantages, limitations, challenges dot-based sensors outline future directions advancement knowledge this surging field.

Язык: Английский

Процитировано

12
Quartz-Enhanced Photoacoustic Spectroscopy-Based Acetone and Ammonia Measurements from Human Breath Near 8 μm Wavelength Band DOI

Saran Kumar K,

Dinesh Jothimani,

Mullaiezhili Manoharan

и другие.

ACS Sensors, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Human breath gas analysis is a noninvasive disease diagnostic approach used to identify different pathological conditions in the human body. Monitoring acetone (C3H6O) and ammonia (NH3) as biomarkers vital diagnosing diabetes mellitus liver disorders, respectively. In this article, quartz-enhanced photoacoustic spectroscopy (QEPAS) technique proposed demonstrated for measuring C3H6O NH3 exhaled samples. We present QEPAS technique-based combined with broadband tunable quantum cascade laser (QCL) operating from 7.9 8.4 μm target both at specific absorption wavelengths. The experimental results show that minimum detection limits (MDLs) of 57 190 ppb were achieved NH3, measured samples collected volunteers. concentration measurements using 8 spectral region agreed blood glucose measurements. measurement limit sensitivity met requirement needed distinguish concentrations obtained healthy person those disorder conditions.

Язык: Английский

Процитировано

2
CdS Quantum Dot Gels as a Direct Hydrogen Atom Transfer Photocatalyst for C−H Activation DOI
Daohua Liu, Atanu Hazra, Xiaolong Liu

и другие.

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(37)

Опубликована: Июнь 20, 2024

Abstract Here, we report CdS quantum dot (QD) gels, a three‐dimensional network of interconnected QDs, as new type direct hydrogen atom transfer (d‐HAT) photocatalyst for C−H activation. We discovered that the photoexcited QD gel could generate various neutral radicals, including α‐amido, heterocyclic, acyl, and benzylic from their corresponding stable molecular substrates, amides, thio/ethers, aldehydes, compounds. Its activation ability imparts broad substrate reaction scope. The mechanistic study reveals this reactivity is intrinsic to materials, radical generation did not proceed via conventional sequential electron proton pathway. Instead, bonds are activated by d‐HAT mechanism. This mechanism supported linear correlation between logarithm bond rate constant dissociation energy (BDE) with Brønsted slope α =0.5. Our findings expand currently limited photocatalysis toolbox provide possibilities photocatalytic

Язык: Английский

Процитировано

9
Investigation of band parameters and electrochemical analysis of multi core-shell CdSe/CdS/ZnS quantum dots DOI
Aneeqa Sabah,

Imrana Shafaqat,

A. Naifar

и другие.

Optical Materials, Год журнала: 2023, Номер 142, С. 114065 - 114065

Опубликована: Июль 2, 2023

Язык: Английский

Процитировано

16
Boosting Photocatalytic CO2 Methanation through Interface Fusion over CdS Quantum Dot Aerogels DOI

Shishun Xu,

Guocan Jiang, Hangkai Zhang

и другие.

Small, Год журнала: 2024, Номер unknown

Опубликована: Май 15, 2024

Abstract In the field of photocatalytic CO 2 reduction, quantum dot (QD) assemblies have emerged as promising candidate photocatalysts due to their superior light absorption and better substrate adsorption. However, poor contacts within QD lead low interfacial charge transfer efficiency, making suffer from unsatisfactory performance. Herein, a novel approach is presented involving construction strongly fused CdS (CdS gel) for reduction. The gel demonstrates outstanding performance methanation, achieving CH 4 generation rate ≈296 µmol g −1 h , with selectivity surpassing 76% an apparent yield (AQY) 1.4%. Further investigations reveal that robust fusion in these QDs not only boosts ability absorb visible but also significantly promotes separation. present work paves way utilizing realizing efficient reduction highlights critical role engineering photocatalysts.

Язык: Английский

Процитировано

6
Electrochemiluminescence of Semiconductor Quantum Dots and Its Biosensing Applications: A Comprehensive Review DOI Creative Commons
Hui Sun, Ping Zhou, Bin Su

и другие.

Biosensors, Год журнала: 2023, Номер 13(7), С. 708 - 708

Опубликована: Июль 5, 2023

Electrochemiluminescence (ECL) is the chemiluminescence triggered by electrochemical reactions. Due to unique excitation mode and inherent low background, ECL has been a powerful analytical technique be widely used in biosensing imaging. As an emerging luminophore, semiconductor quantum dots (QDs) have apparent advantages over traditional molecular luminophores terms of luminescence efficiency signal modulation ability. Therefore, development efficient system with QDs as great significance improve sensitivity detection flux biosensors. In this review, we give comprehensive summary recent advances using luminophores. The process mechanism various coreactants are discussed first. Specifically, influence surface defects on performance emphasized several typical enhancement strategies summarized. Then, applications overviewed, including immunoassay, nucleic acid analysis small molecules. Finally, challenges prospects featured.

Язык: Английский

Процитировано

10
A Paper-Based Biomimetic Sensing Device for the Discrimination of Original and Fraudulent Cigarette Brands Using Mixtures of MoS2 Quantum Dots and Organic Dyes DOI Creative Commons
Fereshte Mohamadi Gharaghani, Sara Mostafapour, Bahram Hemmateenejad

и другие.

Biosensors, Год журнала: 2023, Номер 13(7), С. 705 - 705

Опубликована: Июль 4, 2023

In this study, we investigated the combined effects of MoS2 QDs' catalytic properties and colorimetric responses organic reagents to create a sniffing device based on sensor array concept mammalian olfactory system. The aim was differentiate volatile compounds (VOCs) present in cigarette smoke. designed optical nose utilized for classification various VOCs. Unsupervised Principal Component Analysis (PCA) supervised Linear Discriminant (LDA) methods were employed data analysis. LDA analysis showed promising results, with 100% accuracy both training cross-validation. To validate sensor's performance, assessed its ability discriminate between five brands, achieving set 82% cross-validation set. Additionally, focused studying four popular Iranian brands (Bahman Kootah, Omega, Montana Gold, Williams), including fraudulent samples. Impressively, developed achieved perfect distinguishing these detecting fraud. We further analyzed total 126 samples, original ones, using matrix size (126 × 27). resulting model demonstrated an 98%. Our proposed analytical procedure is characterized by efficiency, affordability, user-friendliness, reliability. selectivity exhibited positions it as valuable tool differentiating counterfeit cigarettes, thus aiding border control efforts worldwide.

Язык: Английский

Процитировано

9
Photoactive metal chalcogenides towards CO2 reduction–a review DOI

Shweta Gomey,

Eksha Guliani,

Kajal Choudhary

и другие.

Colloid & Polymer Science, Год журнала: 2024, Номер 302(8), С. 1149 - 1167

Опубликована: Фев. 23, 2024

Язык: Английский

Процитировано

3
Hydrogen Isotope Labeling of Pharmaceuticals Via Dual Hydrogen Isotope Exchange Pathways Using CdS Quantum Dot Photocatalyst DOI
Rajendra Maity, Otto Dungan, Frédéric A. Perras

и другие.

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(49), С. 34141 - 34151

Опубликована: Ноя. 23, 2024

Isotopic labeling is a powerful technique extensively used in the pharmaceutical industry. By tracking isotope-labeled molecules, researchers gain unique and invaluable insights into pharmacokinetics pharmacodynamics of new drug candidates. Hydrogen isotope particularly important as hydrogen ubiquitous organic molecules biological systems, it can be introduced effectively through late-stage exchange (HIE). However, methods that simultaneously label multiple sites with varying types C-H bonds different are still lacking. Herein, we demonstrate heterogeneous photocatalytic system using CdS quantum dot catalyst proceeds via dual HIE pathway mechanism─one occurs reaction solution other on catalytic surface─to address it. This mechanism unlocked several capabilities, including simultaneous challenging such secondary α-amino, α-ethereal, allyl, vinyl sites, providing great versatility practical uses for labeling.

Язык: Английский

Процитировано

3
Spin effects in regulating the adsorption characteristics of metal ions DOI Creative Commons
Cunyuan Gao, Shiyu Zhen, Yutong Wang

и другие.

Chemical Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Spin-state modulation in ZnCo 2 O 4 spinel oxides through calcination-induced lattice distortion enhances metal ion sensing performance, with a direct correlation between the Co 3+ spin state and electrochemical behavior.

Язык: Английский

Процитировано

0