ppb-level heavy metal ion detection by electrochemistry-assisted nanoPorous silicon (ECA-NPS) photonic sensors

Tsai, Wan-Ting; Nguyen, Minh-Hang; Lai, J. B.; Nguyen, H. Chau; Lee, Ming-Chang; Tseng, Fan‐Gang

doi:10.1016/j.snb.2018.01.232

Cited by 28 publications

(20 citation statements)

References 26 publications

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“…In spite of that, biocompatibility and bioavailability are major issues that determines the potential areas of application which is the main reason for the replacement of hazardous nanoparticles with biocompatible ones [17]. In recent times, some studies show that the researchers are focussing on biocompatible nano-systems to fabricate efficient and cost-effective organic solar cells [18], heavy metal sensors [19][20][21], gas sensors [22] and energy harvesting devices such as nanogenerators [23] and supercapacitors [24][25][26]. These next-generation nano-systems and nano-devices are capable to reduce environmental pollution and delivers greater efficiency [27,28].…”

Section: Introductionmentioning

confidence: 99%

Cu(II) and Gd(III) doped boehmite nanostructures: a comparative study of electrical property and thermal stability

Roy

Bardhan

Chanda

et al. 2020

Mater. Res. Express

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The present article reports the effect of transition (Cu 2+ ) and rare earth metal (Gd 3+ ) ion doping on structural, microstructural and electrical properties of boehmite nanoparticles. Rietveld refinement is adopted here to refine the x-ray diffractograms for further analyzing the microstructural details and their alteration due to the incorporation of foreign cations. This is probably the first time when dielectric properties of these doped boehmite samples having been reported herein. These samples show remarkably high dielectric constant values which corroborate that doping enhances the microstrain values inside the orthorhombic structure and results in higher crystallographic defects. Enhancement in defect sites causes the augmentation of relative permittivity and ac conductivity. Temperature stability has also been enhanced significantly in our Cu-doped sample. The present study enables us to determine a relationship between crystalline deformation and electrical properties of nanomaterials which may be highly beneficial in fabricating cost-effective energy harvesting devices.

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Section: Introductionmentioning

confidence: 99%

Cu(II) and Gd(III) doped boehmite nanostructures: a comparative study of electrical property and thermal stability

Roy

Bardhan

Chanda

et al. 2020

Mater. Res. Express

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show abstract

“…The hybridization reaction between probe DNA and target DNA labelled with QDS at different concentrations was detected by the angle spectrum detection method of free spectrum equipment, and a detection limit of 35.9 pM was obtained. Compared with the experimental results reported above, our proposed assembled microcavity features a lower detection limit [15].…”

Section: Measurement Results and Discussion Of The Angle Spectrum Methodsmentioning

confidence: 60%

“…PSi can be prepared into a variety of biosensors with monolayer [9], [10], Bragg [11], [12], microcavity [13], [14] and other structures. Compared with the Bragg structure, the microcavity (PSM) has the optical characteristics of half-height width and high transmittance at the resonance peak, so it has higher sensitivity [15]. Mariani et al reported a label-free PSi interferometer that was 10,000 times better than the direct (that is, non-amplified) label-free PSi biosensor and was able to specifically detect TNF-α at concentrations down to 3.0 nM, with a detection limit of 200 pM [16].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Biosensor Based on Assembled Porous Silicon Microcavities Using CdSe/ZnS Quantum Dots

et al. 2021

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To further improve the sensitivity of porous siliconassembled microcavity biosensors, the detection of porous silicon assembled microcavity by angle spectrum method is also researched. This contribution uses CdSe/ZnS quantum dotlabelled probe DNA to amplify the refractive index and detect it by the angle spectrum method. The first layer is a microcavity layer, and the next is porous silicon with a Bragg structure. After functionalization, different concentrations of target DNA were coupled to construct quantum dot-labelled probe DNA to bind specifically to the target DNA. With the Bragg device based on quartz glass forming an assembled microcavity structure, using a He-Ne laser as the detection light and collimation beam, the angle spectrum method is used to detect different concentrations of target DNA before and after biological reaction with quantum dotlabelled probe DNA and reflect the angle of minimum light intensity. The experimental results show that with increasing target DNA concentration, probe DNA concentration and angle, the detection limit is 13.25 pM. The angle-spectrum method has been successfully used to detect the assembled porous silicon microcavity. The angle-spectrum method has the advantages of spectrometer free and low cost.

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“…Other pathways for detection based on reflectance usually involve the analysis of the interferogram average over wavelength (IAW–IAW 0 ) [89,97] as well as the estimation of effective optical thickness ratio (EOT/EOT 0 ) [53,54]. For instance, PSi sensors based on the reflectance response for heavy metal detection were studied in [61,97,98,99]. Politi et al reported on the highly-sensitive (LOD ~ 1.2 ± 0.3 ppb) method for Pb(II), As(III), and Cd(II) detection via the modification of PSi surfaces by lysine and oligopeptides [98].…”

Section: (Bio)sensors Based On Psi Sinws Sinps and Their Composimentioning

confidence: 99%

Nanosilicon-Based Composites for (Bio)sensing Applications: Current Status, Advantages, and Perspectives

Myndrul

Iatsunskyi

2019

Materials

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This review highlights the application of different types of nanosilicon (nano-Si) materials and nano-Si-based composites for (bio)sensing applications. Different detection approaches and (bio)functionalization protocols were found for certain types of transducers suitable for the detection of biological compounds and gas molecules. The importance of the immobilization process that is responsible for biosensor performance (biomolecule adsorption, surface properties, surface functionalization, etc.) along with the interaction mechanism between biomolecules and nano-Si are disclosed. Current trends in the fabrication of nano-Si-based composites, basic gas detection mechanisms, and the advantages of nano-Si/metal nanoparticles for surface enhanced Raman spectroscopy (SERS)-based detection are proposed.

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ppb-level heavy metal ion detection by electrochemistry-assisted nanoPorous silicon (ECA-NPS) photonic sensors

Cited by 28 publications

References 26 publications

Cu(II) and Gd(III) doped boehmite nanostructures: a comparative study of electrical property and thermal stability

Cu(II) and Gd(III) doped boehmite nanostructures: a comparative study of electrical property and thermal stability

Enhanced Biosensor Based on Assembled Porous Silicon Microcavities Using CdSe/ZnS Quantum Dots

Nanosilicon-Based Composites for (Bio)sensing Applications: Current Status, Advantages, and Perspectives

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