Rapid detection of hexamethylenetetramine based on the substrate UC@SiO2@Au@Ag using SERS
TL;DR: In this paper, a reliable upconversion (UC) material assembled from Au@Ag (UC@SiO2@Au@Ag), as the substrate, was firstly employed to detect hexamethylenetetramine (HMT) in bean vermicelli by surface enhanced Raman spectroscopy (SERS).
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Abstract: A reliable upconversion (UC) material assembled from Au@Ag (UC@SiO2@Au@Ag), as the substrate, was firstly employed to detect hexamethylenetetramine (HMT) in bean vermicelli by surface enhanced Raman spectroscopy (SERS). In this substrate, UC can convert near-infrared (NIR) light into visible light to promote localized surface plasmon resonance (LSPR) of noble metal nanoparticles to enhance the SERS signal. According to optimized synthesis conditions, the SERS substrate was obtained and evaluated. The substrate shows uniformity with RSD of 7.05% and 7.37% for the Raman vibrations at ∼780 cm−1 and ∼1043 cm−1 respectively, and sensitivity with detection limits of 1 mg L−1 for HMT. Based on the better sensitivity of this method, the artificially positive samples have been detected.
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Citations
A molecularly imprinted fluorescence nanosensor based on upconversion metal-organic frameworks for alpha-cypermethrin specific recognition.
TL;DR: A sensitive molecularly imprinted fluorescent nanosensor based on zeolitic imidazolate frameworks-8 (ZIF-8) and upconversion nanoparticles (UCNPs) was developed for the determination of trace alpha-cypermethrin (α-CPM) for the first time and the satisfactory results obtained were consistent with those obtained by GC-MS.
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Synthesis of g-C3N4 Nanosheets/Au@Ag Nanoparticles Hybrids as SERS Probe for Cancer Cells Diagnostics
Jun Zhao,Guangmei Han,Zhang Zhongping,Changlong JiangJianping Wang,Liu Bianhua,Renyong Liu,Cheng Zhang,Changlong Jiang +7 more
- 01 Jan 2015
TL;DR: In this article, an ultrathin g-C3N4 nanosheet/Au@AgNP hybrid was fabricated using a self-assembly strategy, in which poly(ethyleneimine) (PEI) was used to obtain cationic polyelectrolyte-modified ultra-thin nanosheets and anchor the Au@AgNPs.
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•Journal Article
Highly sensitive and selective novel core-shell molecularly imprinted polymer based on NaYF4: Yb3+, Er3+ upconversion fluorescent nanorods.
Kun Qian,Guozhen Fang,Shuo Wang +2 more
TL;DR: In this paper, a core-shell molecularly imprinted polymer based on β-NaYF4: Yb3+, Er3+ upconversion fluorescent nanoparticles (UCNPs@MIP) has been successfully synthesized, which has a homogeneous polymer film, shows thermal stability, exhibits excellent near-infrared upcon conversion luminescence emission and sensitivity and selectivity towards analytes.
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Characterization of Target Organisms from Environmental Origin for Rapid Bioremediation of Hexamine
Abstract: Abstract The non-aromatic, heterocyclic hexamine is one of the most refractory pollutants in some industrial effluents and food-grade plastics. This compound and its derivatives harm human health with limited options for eco-friendly biological treatment. This study reports the characterization of two rapid hexamine-removing bacterial isolates, Micromonospora citrea SRCHD01 and Micrococcus luteus SRCHD02, from wastewater of Hexamine producing plant at Vishakapatnam, India. The former is a structured biofilm former while the latter is a weak biofilm former with both isolates dividing faster under immobilized conditions. Isolate SRCHD01 could reduce 200 mg/L hexamine to 84.91 mg/L in 24 h with associated Chemical Oxygen Demand (COD) reduction of 99% from an initial concentration of 8028.93 mg/L within 120 h, making it the fastest hexamine-removing bacteria reported till date. The investigation opens a new avenue for studying the bioremediation of hexamine in biofilm reactors ensuring environmental protection.
1
Electrochemical Microplastic Detection using Chitosan-Magnesium Oxide Nanosheet.
Ashab Noumani,Damini Verma,Ajeet Kaushik,Ajit Khosla,Pratima R. Solanki +4 more
TL;DR: Researchers develop an electrochemical sensing system using chitosan-magnesium oxide nanosheets to detect hexamethylenetetramine (HMT) microplastics in water and food samples with a detection limit of 0.03 μM and sensitivity of 12.908 μA (μM)−1 cm-2.
References
Surface-Enhanced Raman Spectroscopy
TL;DR: The use of nanosphere lithography for the fabrication of highly reproducible and robust SERS substrates is described and progress in applying SERS to the detection of chemical warfare agents and several biological molecules is described.
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TL;DR: The ability to control the size, shape, and material of a surface has reinvigorated the field of surface-enhanced Raman spectroscopy (SERS) as mentioned in this paper.
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Core–Shell Nanoparticle-Enhanced Raman Spectroscopy
TL;DR: The concept of shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) in detail is introduced in detail because it overcomes the long-standing limitations of material and morphology generality encountered in traditional SERS.
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Versatile Synthesis Strategy for Carboxylic Acid−functionalized Upconverting Nanophosphors as Biological Labels
Zhigang Chen,Huili Chen,He Hu,Mengxiao Yu,Fuyou Li,Qiang Zhang,Zhiguo Zhou,Tao Yi,Chunhui Huang +8 more
TL;DR: A highly sensitive DNA sensor based on such streptavidin-coupled UCNPs have been prepared, and the demonstrated results suggest that these biocompatible UCnPs have great superiority as luminescent labeling materials for biological applications.
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Controlled Synthesis and Luminescence of Lanthanide Doped NaYF4 Nanocrystals
and Leyu Wang,Yadong Li +1 more
TL;DR: A range of nearly monodispersed NaYF4 single-crystal nanorods, hexagonal nanoplates, and nanoparticles have been successfully prepared via a facile wet chemical technology.
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