Scalable approach towards specific and ultrasensitive cation sensing under harsh environmental conditions by engineering the analyte–transducer interface

Mondal, Sudeshna; Subramaniam, Chandramouli

doi:10.1039/d0na01042a

Cited by 4 publications

(4 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The free-standing porous nature of the OLCMs points to several interesting applications in the domains of energy storage , and environmental remediation. − In this direction, the extensive graphitic surface of the OLCMs was exploited to adsorb and trap VOCs such as toluene. The experiments were conducted with toluene as the model VOC in flow-through geometry to mimic the smoke filter of a cigarette.…”

Section: Resultsmentioning

confidence: 99%

Joule Heating-Driven Transformation of Hard-Carbons to Onion-like Carbon Monoliths for Efficient Capture of Volatile Organic Compounds

Dwivedi

Subramaniam

2021

ACS Mater. Au

Self Cite

View full text Add to dashboard Cite

Soft graphitizable carbon-based multifunctional nanomaterials have found versatile applications ranging from energy storage to quantum computing. In contrast, their hard-carbon analogues have been poorly investigated from both fundamental and application-oriented perspectives. The predominant challenges have been (a) the lack of approaches to fabricate porous hard-carbons and (b) their thermally nongraphitizable nature, leading to inaccessibility for several potential applications. In this direction, we present design principles for fabrication of porous hard-carbon-based nanostructured carbon florets (NCFs) with a highly accessible surface area (∼936 m2/g), rivalling their soft-carbon counterparts. Subjecting such thermally stable hard-carbons to a synergistic combination of an electric field and Joule heating drives their transformation to free-standing macroscopic monoliths composed of onion-like carbons (OLCMs). This represents the first such structural transformation observed in sp2-based hard-carbon NCFs to sp2-networked OLCMs. Micro-Raman spectroscopy establishes the simultaneous increase in the intensity of D-, 2D-, and D + G-bands at 1341, 2712, and 2936 cm–1 and is correlated to the reorganization in the disordered graphitic domains of NCFs to curved concentric nested spheres in OLCMs. This therefore completely precludes the formation of a nanodiamond core that has been consistently observed in all previously reported OLCs. The Joule heating-driven formation of OLCMs is accompanied by ∼5700% enhancement in electrical conductivity that is brought about by the fusion of outermost graphitic shells of OLCs to result in monolithic OLC structures (OLCMs). The porous and inter-networked OLCMs exhibit an excellent adsorption-based capture of volatile organic compounds such as toluene at high efficiencies (∼99%) over a concentration range (0.22–1.86 ppm) that is relevant for direct applications such as smoke filters in cigarettes.

show abstract

Section: Resultsmentioning

confidence: 99%

Joule Heating-Driven Transformation of Hard-Carbons to Onion-like Carbon Monoliths for Efficient Capture of Volatile Organic Compounds

Dwivedi

Subramaniam

2021

ACS Mater. Au

Self Cite

View full text Add to dashboard Cite

show abstract

“…Low zinc levels in the body are important for diagnosing diarrhea and pneumonia [ 66 ], while long-term exposure to high zinc levels can damage the liver and even the heart and lower the number of pancreatic enzymes. Additionally, mercury, lead, and cadmium are known toxic elements that can harm various organ systems in humans including the nervous, immune, and cardiovascular systems [ 67 ]. Therefore, determining how many heavy metals a person has been exposed to through non-invasive sweat can detect a variety of diseases or disorders much quicker than through blood analysis.…”

Section: Applications Of Analytes In Sweatmentioning

confidence: 99%

A Comprehensive Review of the Recent Developments in Wearable Sweat-Sensing Devices

Ibrahim

Sabani

Johari

et al. 2022

Sensors

View full text Add to dashboard Cite

Sweat analysis offers non-invasive real-time on-body measurement for wearable sensors. However, there are still gaps in current developed sweat-sensing devices (SSDs) regarding the concerns of mixing fresh and old sweat and real-time measurement, which are the requirements to ensure accurate the measurement of wearable devices. This review paper discusses these limitations by aiding model designs, features, performance, and the device operation for exploring the SSDs used in different sweat collection tools, focusing on continuous and non-continuous flow sweat analysis. In addition, the paper also comprehensively presents various sweat biomarkers that have been explored by earlier works in order to broaden the use of non-invasive sweat samples in healthcare and related applications. This work also discusses the target analyte’s response mechanism for different sweat compositions, categories of sweat collection devices, and recent advances in SSDs regarding optimal design, functionality, and performance.

show abstract

“…Beside CNT, various modified electrodes have received increasing attention for enhancing the selectivity and sensitivity of mercury electrochemical measurements; a summary of these studies is given in [ 3 , 15 ]. The most used modifiers include metal nanoparticles and films [ 16 , 17 ], polymers [ 18 , 19 ], ion-imprinted polymers [ 20 ], and organic chelators/ionophores [ 21 , 22 , 23 ], such as what is proposed here. Several studies included a combination of these modifiers with carbon nanotubes [ 9 , 24 , 25 , 26 ]; however, in the case of chelators/ionophores, these nanocomposites were mostly used in potentiometric and ion-selective electrodes (ISE) [ 13 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies included a combination of these modifiers with carbon nanotubes [ 9 , 24 , 25 , 26 ]; however, in the case of chelators/ionophores, these nanocomposites were mostly used in potentiometric and ion-selective electrodes (ISE) [ 13 , 27 , 28 ]. As far as the literature survey could reveal, only one sensor with this combination was used in voltammetric detection of Hg [ 21 ], and there is no study using electrodes modified with CNT and organic chelator/ionophore as amperometric sensors.…”

Section: Introductionmentioning

confidence: 99%

Novel Amperometric Mercury-Selective Sensor Based on Organic Chelator Ionophore

et al. 2023

View full text Add to dashboard Cite

A novel amperometric sensor for the direct determination of toxic mercury ions, Hg2+, based on the organic chelator ionophore N, N di (2-hydroxy-5-[(4-nitrophenyl)diazenyl]benzaldehyde) benzene-1,2-diamine (NDBD), and multiwalled carbon nanotubes (MWCNT) immobilized on a glassy carbon electrode surface was developed. The parameters influencing sensor performance including the ionophore concentration, the applied potential, and electrolyte pH were optimized. The sensor response to Hg2+ was linear between 1–25 µM with a limit of detection of 60 nM. Interferences from other heavy metal ions were evaluated and the sensor showed excellent selectivity towards Hg2+. The method was successfully applied to the determination of mercury ions in milk and water samples.

show abstract

Scalable approach towards specific and ultrasensitive cation sensing under harsh environmental conditions by engineering the analyte–transducer interface

Abstract: Affordable and high-performing sensing platforms are becoming increasingly critical for sustainable environmental monitoring and medical diagnostics. Such miniaturized and point-of-care sensing platforms need to overcome the fundamental tradeoff between ultrahigh...

Cited by 4 publications

References 50 publications

Joule Heating-Driven Transformation of Hard-Carbons to Onion-like Carbon Monoliths for Efficient Capture of Volatile Organic Compounds

Joule Heating-Driven Transformation of Hard-Carbons to Onion-like Carbon Monoliths for Efficient Capture of Volatile Organic Compounds

A Comprehensive Review of the Recent Developments in Wearable Sweat-Sensing Devices

Novel Amperometric Mercury-Selective Sensor Based on Organic Chelator Ionophore

Contact Info

Product

Resources

About