Metal nanoparticles and DNA co-functionalized single-walled carbon nanotube gas sensors

Su, Heng; Zhang, Miluo; Bosze, Wayne; Lim, Jae‐Hong; Myung, Nosang V.

doi:10.1088/0957-4484/24/50/505502

Cited by 37 publications

(23 citation statements)

References 48 publications

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“…Along with all these above-mentioned sensors are indicators known as time-temperature integrators. They are mainly of three basic types, namely, abuse indicators, partial temperature history indicator, and full-temperature history indicator [ 42 ]. A time-temperature indicator/integrator helps in detecting the spoilage of food based on the history of temperature.…”

Section: Food Managementmentioning

confidence: 99%

“…A time-temperature indicator/integrator helps in detecting the spoilage of food based on the history of temperature. Abuse indicators are also known as critical temperatures as they help in determining whether the desired temperature has been achieved or not [ 42 ]. Partial temperature history indicator is responsible for integrating time-temperature history when the temperature exceeds a certain predetermined value.…”

Section: Food Managementmentioning

confidence: 99%

“…Partial temperature history indicator is responsible for integrating time-temperature history when the temperature exceeds a certain predetermined value. Full-temperature history indicator registers a continuous change in temperature with respect to time [ 42 ]. Commercial availability of such TTI (time-temperature integrator) in the form of iSTrip, made by the company Timestrip, with the help of colour change, detects the change in temperature of frozen foods [ 42 ].…”

Section: Food Managementmentioning

confidence: 99%

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Facets of Nanotechnology as Seen in Food Processing, Packaging, and Preservation Industry

Pradhan

Singh

Ojha

et al. 2015

BioMed Research International

210

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Nanotechnology has proven its competence in almost all possible fields we are aware of. However, today nanotechnology has evolved in true sense by contributing to a very large extent to the food industry. With the growing number of mouths to feed, production of food is not adequate. It has to be preserved in order to reach to the masses on a global scale. Nanotechnology made the idea a reality by increasing the shelf life of different kinds of food materials. It is not an entirely full-proof measure; however it has brought down the extent of wastage of food due to microbial infestation. Not only fresh food but also healthier food is being designed with the help of nano-delivery systems which act as a carrier for the food supplements. There are regulations to follow however as several of them pose serious threats to the wellbeing of the population. In coming days, newer modes of safeguarding food are going to be developed with the help of nanotechnology. In this paper, an overview has been given of the different methods of food processing, packaging, and preservation techniques and the role nanotechnology plays in the food processing, packaging, and preservation industry.

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Section: Food Managementmentioning

confidence: 99%

Section: Food Managementmentioning

confidence: 99%

Section: Food Managementmentioning

confidence: 99%

See 1 more Smart Citation

Facets of Nanotechnology as Seen in Food Processing, Packaging, and Preservation Industry

Pradhan

Singh

Ojha

et al. 2015

BioMed Research International

210

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“…Currently, very few gas sensors propose DNA as functional material (Wasilewski et al, 2017). The first attempts to use DNA in gas sensing was reported few years ago and was obtained by decoration of carbon nanotubes (Khamis et al, 2012;Kybert et al, 2013;Staii et al, 2005;Su et al, 2013). In a recent work DNA extracted from fish sperm was introduced between a gate dielectric and an organic semiconducting layer to build up an organic field-effect transistor sensor for NO 2 detection (Shi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Hairpin DNA-AuNPs as molecular binding elements for the detection of volatile organic compounds

Mascini

Gaggiotti

Pelle

et al. 2019

Biosensors and Bioelectronics

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Hairpin DNA (hpDNA) loops were used for the first time as molecular binding elements in gas analysis. The hpDNA loops sequences of unpaired bases were studied in-silico to evaluate the binding versus four chemical classes (alcohols, aldehydes, esters and ketones) of volatile organic compounds (VOCs). The virtual binding score trend was correlated to the oligonucleotide size and increased of about 25% from tetramer to hexamer. Two tetramer and pentamer and three hexamer loops were selected to test the recognition ability of the DNA motif. The selection was carried out trying to maximize differences among chemical classes in order to evaluate the ability of the sensors to work as an array. All oligonucleotides showed similar trends with best binding scores for alcohols followed by esters, aldehydes and ketones. The seven ssDNA loops (CCAG, TTCT, CCCGA, TAAGT, ATAATC, CATGTC and CTGCAA) were then extended with the same double helix stem of four base pair DNA (GAAG to 5' end and CTTC to 3' end) and covalently bound to gold nanoparticles (AuNPs) using a thiol spacer attached to 5' end of the hpDNA. HpDNA-AuNPs were deposited onto 20 MHz quartz crystal microbalances (QCMs) to form the gas piezoelectric sensors. An estimation of relative binding affinities was obtained using different amounts of eight VOCs (ethanol, 3-methylbutan-1-ol, 1-pentanol, octanal, nonanal, ethyl acetate, ethyl octanoate, and butane-2,3-dione) representative of the four chemical classes. In agreement with the predicted simulation, hexamer DNA loops improved by two orders of magnitude the binding affinity highlighting the key role of the hpDNA loop size. Using the sensors as an array a clear discrimination of VOCs on the basis of molecular weight and functional groups was achieved, analyzing the experimental with principal components analysis (PCA) demonstrating that HpDNA is a promising molecular binding element for analysis of VOCs.

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“…20,21 A highly doped p-type Si wafer (Ultrasil Corporation, Hayward, CA) with a 300 nm oxidation layer (grown by low pressure chemical vapor deposition) was used as the substrate. A positive photoresist AZ 5214-E (AZ Electronics Materials USA Corporation, Somerville, NJ) was spin-coated on the substrate at 1000 RPM for 2 s followed by 3000 RPM for 30 s. The substrate was then placed on a hot plate at 110 • C for 5 min.…”

Section: Methodsmentioning

confidence: 99%

Tin Dioxide Functionalized Single-Walled Carbon Nanotube (SnO₂/SWNT)-Based Ammonia Gas Sensors and Their Sensing Mechanism

Zhang

Bosze

et al. 2014

J. Electrochem. Soc.

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Tin oxide functionalized single-walled carbon nanotubes (SWNTs) were synthesized on prefabricated microelectrodes by an electrochemical process. The shape, morphology, valence state and crystal structure of tin oxide were controlled by varying the deposition potential (E), charge density (C), and subsequent calcining temperature (T) and their structure-related sensing performance toward ammonia (NH 3 ) gas was characterized at 25 • C. Optimal sensing performance was obtained under the conditions of E = −0.625 V, C = 0.125 C/cm 2 , T = 400 • C. The underlying NH 3 sensing mechanisms of the SnO 2 /SWNTs hybrid nanostructures were studied, indicating that the higher Sn 2+ dopants in SnO 2 (obtained at a higher applied potential of −0.625 V) in the oxides as well as the greater active surface area (obtained at the optimal charge density of 0.125 C/cm 2 ) and the lowest calcining temperature of 400 • C are the key factors in improving the sensing performance. Selectivity of the gas sensors was determined by exposing them to CO and NO 2 at room temperature.Chemical sensors based on various nanostructures has attracted enormous attention, where gas sensing is now widely held as one of the most promising areas which nanotechnology will have a significant impact. 1 Advancements in nanotechnology have prompted the utilization of one-dimensional (1-D) semiconducting nanostructures as novel transducer materials 2 in sensing devices due to their ultra-high surface area-to-volume ratio that enhances surface adsorptive capacity, tunable electrical properties via dopants, and the ability to form ultra-high density arrays in small dimensions. In particular, single walled carbon nanotubes (SWNTs) have become a promising 1-D nanomaterial to develop devices with miniaturized size, simplicity, reliability, and low cost. 3-5 Even though pristine SWNTs display poor sensitivity and selectivity as a gas sensing material, its unique electronic properties have motivated researchers to use SWNTs as mandrels and to enhance their sensing capabilities through decoration of other materials (e.g., metals, metal oxides, conducting polymers). Metal oxides have been reported as good sensing materials for various analytes. 6 In particular, semiconducting metal oxides such as ZnO, 7 SnO 2 , 8-10 MoO 3 , 11 and Ga 2 O 3 9,12 were reported as good candidates for sensing gases such as CO, NO 2 and NH 3 under elevated temperature. Such metal oxide/SWNTs hybrid based chemiresistors are exploited by their enhanced sensitivity and selectivity toward various gaseous analytes via charge interactions with the SWNT mandrel and by simple measurement set up.SnO 2 is a n-type semiconductor with a wide bandgap (E g = 3.6 eV), excellent chemical stability, and sensing capability which makes it a suitable transducer material in gas sensors. 9 However, due to its high electrical resistivity at ambient temperature as synthesized, SnO 2 as a transducer must be operated at an elevated temperature for optimal performance. 8,13 To overcome this obstacle, 1-D nanomaterials ...

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Metal nanoparticles and DNA co-functionalized single-walled carbon nanotube gas sensors

Cited by 37 publications

References 48 publications

Facets of Nanotechnology as Seen in Food Processing, Packaging, and Preservation Industry

Facets of Nanotechnology as Seen in Food Processing, Packaging, and Preservation Industry

Hairpin DNA-AuNPs as molecular binding elements for the detection of volatile organic compounds

Tin Dioxide Functionalized Single-Walled Carbon Nanotube (SnO₂/SWNT)-Based Ammonia Gas Sensors and Their Sensing Mechanism

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Metal nanoparticles and DNA co-functionalized single-walled carbon nanotube gas sensors

Cited by 37 publications

References 48 publications

Facets of Nanotechnology as Seen in Food Processing, Packaging, and Preservation Industry

Facets of Nanotechnology as Seen in Food Processing, Packaging, and Preservation Industry

Hairpin DNA-AuNPs as molecular binding elements for the detection of volatile organic compounds

Tin Dioxide Functionalized Single-Walled Carbon Nanotube (SnO2/SWNT)-Based Ammonia Gas Sensors and Their Sensing Mechanism

Contact Info

Product

Resources

About

Tin Dioxide Functionalized Single-Walled Carbon Nanotube (SnO₂/SWNT)-Based Ammonia Gas Sensors and Their Sensing Mechanism