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Article
Engineering, Electrical & Electronic
Zhaoxin Geng et al.
Summary: Smartphone-based colorimetric sensors are able to perform testing and diagnostics outside of the laboratory, addressing urgent needs such as point-of-care testing. The quality of captured colorimetric images has a direct impact on detection sensitivity, and experimenters can optimize the images through customization of accessories and parameter settings. This paper introduces common colorimetric transduction mechanisms and reviews the pros and cons of different color spaces. It analyzes and discusses the performance in signal enhancement and structural design of paper-based, plastic microfluidic chip-based, microtiter plate-based, and cuvette-based platforms combined with smartphones, citing a total of 45 reports from 2017 to 2022. The paper also introduces optimization algorithms for data processing and feature extraction, and discusses existing challenges. The aim of this review is to provide comprehensive solutions to the issues encountered in smartphone-assisted colorimetric sensing.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Environmental Sciences
Jose Ruiz-Jimenez et al.
Summary: Solid phase microextraction Arrow and thermal desorption-gas chromatography-mass spectrometry were used to collect and evaluate volatile organic compounds (VOCs) emitted by fungal cultures from building insulation materials and indoor air. Various statistical analyses were employed to visualize and assess differences between samples, and a screening tool based on SIMCA was developed for identifying fungal contamination of indoor air. The study found clear differences in VOC profiles emitted by different fungal strains and in insulation materials from different sources, and identified common VOCs between indoor air and insulation materials. The SIMCA model demonstrated a high prediction capacity for distinguishing between control and fungi-contaminated houses.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Applied
Xinyi Zhao et al.
Summary: In this study, a diethylamino methanone Schiff base (HBAPE) with photochromism and high sensitivity towards UV radiation was reported. The synthesis, quantum chemical calculations, and photophysical behaviors of HBAPE were systematically studied. Furthermore, a data-recording film with rewritability and a data encryption-decryption strategy were developed.
Review
Environmental Sciences
Christos H. Halios et al.
Summary: Volatile Organic Compounds (VOCs) are a significant class of potentially toxic indoor air chemicals. However, due to limited understanding of the relationship between indoor VOC concentrations and health outcomes, there are currently no universal health-based guideline values for VOCs in Europe, including the UK. This study identified 65 individual VOCs in European residences, with building and construction materials being the main source of VOC emissions. Formaldehyde concentrations decreased over the years, while acetone was found to be abundant but underreported. A new approach based on operational indoor air quality surveillance can reveal trends and identify new VOC compounds.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Analytical
Mostafa Shooshtari et al.
Summary: This paper presents a modification to carbon nanotubes (CNTs) to improve the sensitivity to volatile organic compounds (VOCs) and enhance the stability of CNT sensors. By growing titanium dioxide nanowires (TiO2-NW) on the surface of CNTs, the sensors show increased sensitivity and reduced response time. Using virtual arrays of an electronic nose (E-nose), new features are extracted from the data and classified using support vector machine (SVM) algorithms. The paper achieves high accuracy in classifying different VOC gases.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Review
Materials Science, Multidisciplinary
Li Yang et al.
Summary: Volatile organic compounds (VOCs) are important indoor and outdoor air pollutants. Among the various methods for VOC elimination, catalytic combustion using perovskite oxides has gained significant attention due to its high efficiency, low cost, simple operation, and easy scalability. This comprehensive review focuses on recent advances in perovskite oxides for VOC elimination, including material design strategies such as compositional tuning, morphology control, nanostructure building, hybrid construction, and surface modification. The review also highlights the importance of material composition, morphology, and surface/bulk properties on the catalytic performance of perovskite oxides.
ENERGY & ENVIRONMENTAL MATERIALS
(2022)
Article
Engineering, Biomedical
Qian Wu et al.
Summary: This review discusses the recent advances in aggregation-induced emission (AIE) for brain imaging and therapy. AIE fluorophores, through rational design and functionalized strategies, demonstrate superior properties such as deep tissue penetration, high contrast to autofluorescence, and efficient blood-brain barrier crossing.
Article
Plant Sciences
M. Meischner et al.
Summary: This study analyzed soil VOC emissions and respiration in a Mediterranean cork oak ecosystem, comparing invaded and non-invaded sites. The results showed that shrub invasion significantly influenced soil VOC emissions, particularly the emissions of oxygenated VOCs. Low soil moisture enhanced the impact of shrub invasion on VOC emissions.
Article
Computer Science, Information Systems
Jungmo Ahn et al.
Summary: Improvements in small sized sensors now allow easy detection of volatile organic compounds (VOCs) in the air using IoT devices. However, classifying the types of VOCs in the environment remains complex. VOCkit combines chemically-designed fluorometric sensors with an imaging system for non-chemical experts to detect and classify VOCs easily.
Article
Chemistry, Analytical
Darshil Patel et al.
Summary: This study focused on detecting the multiple complex compounds classes produced by the pyrolysis of E-cigarette liquids using comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry. The results showed that heating E-liquids emits over 1000 volatile compounds, of which over 150 are toxic. The application of this technique allows a better understanding of the potential health effects of vaping.
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2021)
Review
Engineering, Multidisciplinary
Yajun Fan et al.
Summary: Digital image colorimetry (DIC) on smartphone is a powerful, fast, and cost-effective analysis method for measuring target analytes through color changes in digital images. It is currently used in various fields with revealed advantages and disadvantages. In the future, DIC technology will become more robust and reliable with the continuous development of smartphone technology.
Article
Chemistry, Multidisciplinary
Emer Duffy et al.
Summary: Measurement of cooking-associated air pollution indoors is crucial for exposure monitoring and human health risk assessment. The colorimetric sensor array (CSA) provides a new method for characterizing volatile organic compounds produced from cooking, enabling molecular recognition of harmful substances and differentiation of emissions from different sources, such as heated cooking oils. Gas chromatography-mass spectrometry analysis validated the sensor results, demonstrating the potential of the sensor array for evaluating cooking emissions as a source of indoor air pollution.
Article
Chemistry, Analytical
Mohsen Salimi et al.
Summary: Gas sensors based on nanostructured ZnO are promising for monitoring VOCs as disease biomarkers. A simple method for rapid synthesis of zinc oxide nanosheets was introduced in this study, along with the fabrication of a smartphone-based resistive gas sensor for detecting VOCs considered as lung cancer biomarkers.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Applied
Jiangting Hu et al.
Summary: Solid-supported sensors and devices benefit greatly from aggregation-induced emission (AIE) molecular systems due to their high emission efficiency. The AIE luminogen studied here can exhibit reversible mechanochromic luminescence in response to mechanical stimuli and volatile organic compound (VOC) fumigation, leading to the fabrication of a wearable cellulose sensor with high visual discrimination for low detection of VOC.
Article
Chemistry, Applied
Xunxue Zhang et al.
Summary: This study unveils the synthesis and photophysical properties of a donor-acceptor aggregation-induced emission (AIE) compound, DHPM, and its unique defect-induced photoluminescence (DIPL) behavior. DHPM is non-emissive in its crystalline state, but shows high emission at crystal defect points. Mechanical force down to mN level can activate the defect-induced photoluminescence, turning it into a mechanoresponsive luminescence. The aggregate of DHPM molecules into D-A coupling pi-dimers in the crystalline state inhibits luminescence, but external mechanical stimuli can disassemble the dimers and induce much higher photoluminescence.
Article
Chemistry, Applied
Fukuyo Tanaka et al.
Article
Physics, Atomic, Molecular & Chemical
Bartosz Michalczuk et al.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2020)
Review
Chemistry, Multidisciplinary
Christine K. McGinn et al.
Article
Chemistry, Multidisciplinary
Jesse L. Butterfield et al.
Article
Chemistry, Analytical
Soonjae Pyo et al.
SENSORS AND ACTUATORS B-CHEMICAL
(2019)
Review
Chemistry, Analytical
Patrick Cesar Ferreira et al.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2019)
Article
Chemistry, Multidisciplinary
Salah M. Tawfik et al.
Article
Chemistry, Multidisciplinary
Xinzhao Xu et al.
Article
Chemistry, Analytical
Jingqi Han et al.
SENSORS AND ACTUATORS B-CHEMICAL
(2018)
Article
Chemistry, Multidisciplinary
Wenbo Wu et al.
MATERIALS HORIZONS
(2017)
Article
Chemistry, Analytical
Manki Son et al.
ANALYTICAL CHEMISTRY
(2016)
Review
Biophysics
Yekbun Adiguzel et al.
BIOSENSORS & BIOELECTRONICS
(2015)
Review
Chemistry, Multidisciplinary
Ju Mei et al.
Review
Chemistry, Multidisciplinary
ZR Grabowski et al.
