Viral-assisted assembly and photoelectric response of individual Au/CdSe core–shell nanowires

Joo, John H.; Hodelin, Juan F.; Hu, Evelyn L.; Haberer, Elaine D.

doi:10.1016/j.matlet.2012.09.001

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…As depicted in figures 1(a)-(d), to form H 2 S gas sensors, bio-templated gold nanowires were assembled on electrodes fabricated on a Si/SiO 2 substrate using a modification of a previously reported procedure [30,31]. A gold-binding [26] M13 bacteriophage was used as the template.…”

Section: Assembly Of Viral-templated Gold Nanowire Gas Sensorsmentioning

confidence: 99%

Highly sensitive hydrogen sulfide (H₂S) gas sensors from viral-templated nanocrystalline gold nanowires

Moon¹,

Zhang²,

Myung³

et al. 2014

Nanotechnology

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A facile, site-specific viral-templated assembly method was used to fabricate sensitive hydrogen sulfide (H2S) gas sensors at room temperature. A gold-binding M13 bacteriophage served to organize gold nanoparticles into linear arrays which were used as seeds for subsequent nanowire formation through electroless deposition. Nanowire widths and densities within the sensors were modified by electroless deposition time and phage concentration, respectively, to tune device resistance. Chemiresistive H2S gas sensors with superior room temperature sensing performance were produced with sensitivity of 654%/ppm(v), theoretical lowest detection limit of 2 ppb(v), and 70% recovery within 9 min for 0.025 ppm(v). The role of the viral template and associated gold-binding peptide was elucidated by removing organics using a short O₂ plasma treatment followed by an ethanol dip. The template and gold-binding peptide were crucial to electrical and sensor performance. Without surface organics, the resistance fell by several orders of magnitude, the sensitivity dropped by more than a factor of 100 to 6%/ppm(v), the lower limit of detection increased, and no recovery was detected with dry air flow. Viral templates provide a novel, alternative fabrication route for highly sensitive, nanostructured H2S gas sensors.

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Section: Assembly Of Viral-templated Gold Nanowire Gas Sensorsmentioning

confidence: 99%

Highly sensitive hydrogen sulfide (H₂S) gas sensors from viral-templated nanocrystalline gold nanowires

Moon¹,

Zhang²,

Myung³

et al. 2014

Nanotechnology

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“…Following an approach similar to Joo et al and Haberer et al [26,27], gold-binding M13 bacteriophages were used to template chains of Au NPs. This filament-shaped biological support displayed a peptide fusion on the N-terminus of each pVIII major coat protein which conferred Au affinity and was essential for assembly.…”

Section: Viral-directed Assembly Of Gold (Au) Nanoparticle (Np) Chainsmentioning

confidence: 99%

Viral-templated gold/polypyrrole nanopeapods for an ammonia gas sensor

et al. 2016

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One-dimensional gold/polypyrrole (Au/PPy) nanopeapods were fabricated using a viral template: M13 bacteriophage. The genetically modified filamentous virus displayed gold-binding peptides along its length, allowing selective attachment of gold nanoparticles (Au NPs) under ambient conditions. A PPy shell was electropolymerized on the viral-templated Au NP chains forming nanopeapod structures. The PPy shell morphology and thickness were controlled through electrodeposition potential and time, resulting in an ultra-thin conductive polymer shell of 17.4 ± 3.3 nm. A post-electrodeposition acid treatment was used to modify the electrical properties of these hybrid materials. The electrical resistance of the nanopeapods was monitored at each assembly step. Chemiresistive ammonia (NH3) gas sensors were developed from networks of the hybrid Au/PPy nanostructures. Room temperature sensing performance was evaluated from 5 to 50 ppmv and a mixture of reversible and irreversible chemiresistive behavior was observed. A sensitivity of 0.30%/ppmv was found for NH3 concentrations of 10 ppmv or less, and a lowest detection limit (LDL) of 0.007 ppmv was calculated. Furthermore, acid-treated devices exhibited an enhanced sensitivity of 1.26%/ppmv within the same concentration range and a calculated LDL of 0.005 ppmv.

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“…A number of chemical methods for semiconductor‐plasmonic HNMs have been developed, among the most popular approach being core/shell heterostructures. [ 10–13 ] The hypothesis behind this is that the local electric field, amplified by SPR, increases the rate of radiative decay, thereby enhancing the emission intensity of adjacent semiconductor NPs. [ 14,15 ] However, in practice, core–shell hybrids often exhibit significant photoluminescence (PL) quenching attributed to excessive metal–semiconductor interactions within the heterostructure.…”

Section: Introductionmentioning

confidence: 99%

CdSe/Ag Hybrid Aerogels: Integration of Plasmonic and Excitonic Properties of Metal–Semiconductor Nanostructures via Sol–Gel Assembly

Liyanage

Spera

Sarkar

et al. 2021

Advanced Photonics Research

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Metal–semiconductor hybrid nanomaterials (HNMs) exhibit unique properties that are distinct from individual nanostructures, leading to promising applications in optical technologies. The interfacial linkage of semiconductor and metal nanoparticles (NPs) via cogelation is an effective strategy to produce HNMs that show strong plasmon‐exciton coupling and improved physical properties. However, optical properties of these hybrids show little to no tunability. Herein, CdSe/Ag hybrid aerogels that show tunable absorption and photoluminescence (PL) are produced by cogelation of CdSe nanorods (NRs) or NPs with Ag hollow NPs. Hybrid electronic states are created by overlapping the excitonic absorption of CdSe NRs or NPs with the plasmonic absorption of Ag NPs. Physical characterization of the hybrids reveals an interconnected network of hexagonal CdSe and cubic Ag NPs, linked by Ag+ and Se2− surface species, without intervening ligands. PL spectra exhibit maxima at 640 and 720 nm for the CdSe NPs/Ag and CdSe NRs/Ag hybrids, respectively, corresponding to new radiative decay mechanisms. Time‐resolved PL data support the emergence of new radiative pathways, kinetically and energetically distinct from the excitonic and plasmonic properties of primary NPs. This new approach of metal–semiconductor hybrid formation through cogelation is intriguing for the design of high‐efficiency HNMs without detrimental PL quenching.

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Viral-assisted assembly and photoelectric response of individual Au/CdSe core–shell nanowires

Cited by 5 publications

References 13 publications

Highly sensitive hydrogen sulfide (H₂S) gas sensors from viral-templated nanocrystalline gold nanowires

Highly sensitive hydrogen sulfide (H₂S) gas sensors from viral-templated nanocrystalline gold nanowires

Viral-templated gold/polypyrrole nanopeapods for an ammonia gas sensor

CdSe/Ag Hybrid Aerogels: Integration of Plasmonic and Excitonic Properties of Metal–Semiconductor Nanostructures via Sol–Gel Assembly

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Viral-assisted assembly and photoelectric response of individual Au/CdSe core–shell nanowires

Cited by 5 publications

References 13 publications

Highly sensitive hydrogen sulfide (H2S) gas sensors from viral-templated nanocrystalline gold nanowires

Highly sensitive hydrogen sulfide (H2S) gas sensors from viral-templated nanocrystalline gold nanowires

Viral-templated gold/polypyrrole nanopeapods for an ammonia gas sensor

CdSe/Ag Hybrid Aerogels: Integration of Plasmonic and Excitonic Properties of Metal–Semiconductor Nanostructures via Sol–Gel Assembly

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Highly sensitive hydrogen sulfide (H₂S) gas sensors from viral-templated nanocrystalline gold nanowires

Highly sensitive hydrogen sulfide (H₂S) gas sensors from viral-templated nanocrystalline gold nanowires