Article
Environmental Sciences
Yingying Qi, Dandan Song, Yiting Chen
Summary: A colorimetric sensor using a GO/AuNPs nanocomposite as a peroxidase mimic has been developed for Hg2+ detection with high sensitivity and selectivity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Analytical
Jingjing Yu, Francis Tsow, Sabrina Jimena Mora, Vishal Varun Tipparaju, Xiaojun Xian
Summary: By incorporating hydrogel into colorimetric sensors, researchers have successfully mitigated humidity interference and improved analytical performance. Field tests have validated the accuracy and reliability of the hydrogel-incorporated sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Lishan Li, Nianchen Zhou, Yue Zhao
Summary: Humidity sensors play a crucial role in humidity detection in various storage and manufacturing processes. This study investigates the use of easily accessible compounds to create thin films with reversible and tunable color changes in response to humidity, demonstrating high sensitivity, fast color change, and recovery speed. The promising properties of this colorimetric humidity sensing technology are showcased with potential applications in dynamic art painting, smart windows, and respiration monitoring.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Environmental Sciences
Karnan Singaravelu Dharshini, T. Yokesh, Mariappan Mariappan, Fuad Ameen, M. Amirul Islam, Anbazhagan Veerappan
Summary: In this study, silver nanoparticles (AgNPs) were synthesized using eco-friendly methods and their potential for detecting Hg2+ ions in environmental samples was investigated. The aqueous extract of Hemidesmus indicus root rapidly converted silver ions into AgNPs under sunlight. The synthesized AgNPs were found to detect Hg2+ ions and could be immobilized onto paper to create a portable device for sensing mercury in water.
Article
Materials Science, Multidisciplinary
Daoye Zheng, Yao Wen, Xiaocan Xu, Yu-Sheng Lin
Summary: We propose and demonstrate a metamaterial grating sensor composed of gold nanograting on a silver thin-film and encapsulated with a PDMS microfluidic chip. The sensor is sensitive to the wavevector of incident light and exhibits angle-dependent reflection spectra, with resonance peaks showing blue-shifts when isopropyl alcohol and deionized water solutions are injected. The reflected color also changes with different solutions in the ambient light environment.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Analytical
Haiyu Li, Wan Wang, Zhijuan Wang, Qing Lv, Hua Bai, Qing Zhang
Summary: A paper-based colorimetric device for Hg2+ detection was developed using CdSe/ZnS quantum dots and TMB, achieving a low detection limit and accurate detection of real samples.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Rahul Kaushik, Rahul Sakla, Nikhil Kumar, Amrita Ghosh, Vikas D. Ghule, D. Amilan Jose
Summary: The organic molecule-based sensor MASP is able to detect multiple analytes with high sensitivity, utilizing fluorescence emission and color changes for sensitive colorimetric detection. The sensor's distinct color changes also help discriminate between different cations, making it a versatile tool for practical applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Biophysics
Antonia Lopreside, Laura Montali, Baojun Wang, Annalisa Tassoni, Maura Ferri, Maria Maddalena Calabretta, Elisa Michelini
Summary: This low-cost biosensor integrates three different biorecognition principles for orthogonal detection of mercury(II) on a three-leaf paper, providing a stable disposable device that can easily be inserted into a smartphone for mercury detection in water samples, with a detection limit reaching ppb levels.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Chemistry, Analytical
Sukhdev Singh, Bruno Coulomb, Jean-Luc Boudenne, Damien Bonne, Frederic Dumur, Bertrand Simon, Fabien Robert-Peillard
Summary: A new procedure utilizing a Rhodamine-based fluorescent sensor has been developed to accurately detect Hg2+ ions in water samples. With optimized experimental conditions, including the incorporation of Rhodamine-6G fluorophore and a buffer system with acetic acid at pH 5.25, the sensitivity and selectivity have been significantly enhanced. This procedure has been successfully applied to tap and river waters with good results.
Article
Environmental Sciences
Greeshma Gigi, Akhila Maheswari Mohan
Summary: The current study developed a portable solid-state opto-sensor for selective and sensitive detection of ultra-trace Hg2+ ions in water samples. The sensor was fabricated by impregnating a chromoionophoric probe onto a porous polymer framework, serving as an efficient platform for regenerative sensing. The sensor exhibited superior color shift and had a broad linear response range, low detection limit, and reusability potential.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Analytical
Yanli Li, Yanmei Si, Genmei Yang, Lixia Yang, Hua Wang
Summary: A target-responsive ratiometric fluorimetric sensing strategy for Hg2+ was designed using a functionalized metal-organic framework. The sensing probe consisted of Eu-MOF nano-spheres with arylboronic acid as the functional recognition group. The method achieved ratiometric fluorimetric sensing by calculating the peak intensity ratio of F-615/F-338 and showed excellent performance in detecting heavy metal ions in environmental monitoring.
ANALYTICAL METHODS
(2023)
Article
Engineering, Environmental
Yong Qi, Donghui Kou, Yudong Sun, Tong Hu, Hang Yuan, Changtong Zhou, Chang Li, An-Hui Lu, Suli Wu, Shufen Zhang
Summary: The colorimetric sensing of ethanol concentration can accelerate the digitalization of the ethanol industry. The development of alcohol detectors with advanced structural color output and reconfigurable nanostructures will lead to a breakthrough in colorimeter sensor technology. In this study, a novel portable colorimetric photonic indicator (CPI) was fabricated, which can accurately differentiate alcohol concentrations ranging from 0 to 100%. By leveraging shape memory photonic crystals and a copolymer with autonomous solvent control, CPI demonstrates rapid color response (<1 s) to ethanol concentration and exhibits structural colors across the range of approximately 477 to approximately 628 nm. The coloration and color-change mechanisms of CPI are attributed to hydrogen bond remodeling, shape memory effects, and reversible structural transformations induced by solvent co-solvency. The real-time visual concentration-detection capabilities of CPI have been validated by measuring distillate concentration during alcohol distillation. This research suggests that CPIs have potential applications in automated and wide-ranging molecule detection devices in the fields of biomedical and chemical engineering.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Zeynep Gungor, Hava Ozay
Summary: In this study, an acrylate derivative with indicator feature was synthesized and applied in the preparation of hydrogel systems. The results showed that the APTMACl-based hydrogel exhibited superior performance as a colorimetric pH sensor in terms of wide color range, fast response time, and mechanical strength.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Engineering, Environmental
Yang Shi, Zheng Liu, Ran Liu, Rong Wu, Jingjing Zhang
Summary: MXene-based nanozymes have unique properties that make them suitable for environmental monitoring and medical diagnostics. However, their low activity and limited recognition functions hinder their practical applications. This study develops a simple and versatile surface engineering strategy to synthesize MXene/DNA/Pt nanocomposites with excellent activity. It also proposes a nanozyme-based Hg2+ sensor with high sensitivity and selectivity for fast on-site detection.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Jose Luis Montano-Priede, Maria Sanroman-Iglesias, Nerea Zabala, Marek Grzelczak, Javier Aizpurua
Summary: The design rules for nanoparticle aggregation-based sensors are unclear due to the lack of control over interparticle distances and orientations. We identified the optimal geometrical parameters that maximize the color difference upon nanoparticle clustering, enabling fast and reliable readout methods.
