Synergetic Accrual of Lamellar Nanohybrids for Band-Selective Photodetection

Aaryashree, Aaryashree; Sharma, Pankaj; Mandal, Biswajit; Biswas, Ajay; Manna, Manoj K.; Maiti, Sayan; Das, Apurba K.; Mukherjee, Shaibal

doi:10.1021/acs.jpcc.7b04219

Cited by 11 publications

(3 citation statements)

References 35 publications

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“…During hydrothermal synthesis of NBA–ZnO nanohybrids, in the beginning, hexagonal zinc hydroxide nuclei forms from the reaction of reagents (Zn(NO 3 ) 2 ·6H 2 O and HMTA) in the solution with the help of temperature treatment at 65 °C and constant stirring. After adding NBA in the solution, the carboxylic groups of NBA creates covalent bonds with zinc hydroxide to give structural stability to the nanohybrid architecture. − At the same time, the hexagonal zinc hydroxide nuclei get transformed into a nuclei of inorganic-hydroxide phases in the lamellar NBA–ZnO hybrid. Here, aromatic faces of NBA favor intermolecular π–π stacking interactions to construct supramolecular organic galleries. ,− After this, these hybrid nuclei connect through assembly process to form vertically aligned connected nanoplates.…”

Section: Methodsmentioning

confidence: 99%

π-Conjugated Amine–ZnO Nanohybrids for the Selective Detection of CO₂ Gas at Room Temperature

Mandal

Biswas

Aaryashree

et al. 2018

ACS Appl. Nano Mater.

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The development of a new type of hybrid material comprising naphthalene-based π-conjugated amine (NBA) and zinc oxide (ZnO) nanohybrid, grown in situ on polydimethylsiloxane (PDMS) flexible substrate, is explored. The morphology of the nanohybrids is controlled by optimizing growth time of the hydrothermal reaction. The CO 2 sensor utilizing NBA−ZnO nanohybrids shows outstanding sensing performance with a maximum response of ∼9% to 500 ppm of CO 2 at room temperature and a comparatively fast response/recovery time (∼3/6 min). The sensor has excellent mechanical flexibility with consistent sensing performance under bending/relaxing process. Hydrophobic nature of the NBA provides less humidity effect on the sensing performance of the NBA−ZnO nanohybrids, which make it suitable for room-temperature application. Also, the presence of layer-by-layer assembly in the NBA−ZnO nanohybrids provides a superior path for carrier transport, which reduces the response and recovery time. All these results indicate that NBA−ZnO nanohybrid is a promising material for room temperature CO 2 sensing application.

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Section: Methodsmentioning

confidence: 99%

π-Conjugated Amine–ZnO Nanohybrids for the Selective Detection of CO₂ Gas at Room Temperature

Mandal

Biswas

Aaryashree

et al. 2018

ACS Appl. Nano Mater.

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“…, the gain was calculated to be ~10 at 6 V applied reverse bias, which is similar to the gain measured by the IPCE system. Considering the dark current as the major source of noise, the specific detectivity ( D * ) of the devices is given by equation ( 5) [31]…”

Section: Optical Properties and Photoresponse Of Heterojunction Devicesmentioning

confidence: 99%

Trap assisted charge multiplication enhanced photoresponse of Li–P codopedp-ZnO/n-Si heterojunction ultraviolet photodetectors

Sharma¹,

Bhardwaj²,

Kumar³

et al. 2018

J. Phys. D: Appl. Phys.

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In this work, we report a high-performance p-ZnO/n-Si heterojunction-based ultraviolet (UV) photodetector fabricated by dual ion beam sputter deposition. The lithium–phosphorus (Li–P) codoping route was used to realize low resistive and stable p-type ZnO. The current–voltage characteristics of p-ZnO/n-Si heterojunction photodiode showed good rectifying behavior with a rectification ratio of 170 at ±3 V. The spectral response measurements of the photodiode showed excellent responsivity with a peak observed around ~325 nm and cutoff wavelength around 370 nm. The maximum responsivity achieved was 2.6 A W−1 at an applied reverse bias of −6 V. The external quantum efficiency determined was of the order of ~1000% which is attributed to the trap assisted multiplication of charge carriers.

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“…For the case of single-pot hydrothermal synthesis of ODBA-ZnO, initially, the reaction between the precursor salt (Zn(NO 3 ) 2 ·6H 2 O) and the base (NH 4 OH) in the water solvent medium creates hexagonal zinc hydroxide (Zn(OH) 2 ) nuclei at 65 °C. Next, covalent bonds are formed between the Zn(OH) 2 nuclei and ODBA at 95 °C to give structural stability in the hybrid structure. − At the same time, an alternating layer-by-layer assembly of organic ODBA and inorganic Zn(OH) 2 creates a chain-like structure as shown in Figure . During calcination, the zinc hydroxide phases of the lamellar hybrid architecture are converted into oxide phases.…”

Section: Resultsmentioning

confidence: 99%

Organo-di-benzoic-acidified ZnO Nanohybrids for Highly Selective Detection of CO at Low Temperature

et al. 2020

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A chemiresistive carbon monoxide (CO) gas sensor comprising of an organo-di-benzoic acidified zinc oxide (ODBA-ZnO) nanohybrid material is reported. The ODBA-ZnO hybrid material is prepared via a single-pot hydrothermal method. The electrical resistance of the drop-casted ODBA-ZnO film on interdigitated electrodes increases noticeably upon exposure to CO (5−500 ppm). The resistance increase is attributed to the formation of complex ions at the organic (ODBA)−inorganic (ZnO) interface in the presence of CO. The detailed CO sensing properties of the ODBA-ZnO nanohybrids reveal a remarkable selectivity to CO gas in comparison to other gases like CO 2 , H 2 S, and NH 3 at 125 °C. The maximum response to 100 ppm of CO is observed to be 35% with the achieved selectivity to CO being 88%, which is the best reported CO selectivity result available in the literature to date. The ODBA-ZnO nanohybrid sensor takes nearly 91 s to reach the saturated response to 100 ppm of CO and nearly 175 s to recover from it in a synthetic air environment. A systematic study using field emission scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, nitrogen adsorption−desorption tests, and thermogravimetric analysis reveals that introduction of an organic moiety (ODBA) to ZnO played a key role in achieving improved selectivity and sensitivity toward CO. The present work provides a simple route for fabricating the ODBA-ZnO sensor to achieve better selectivity and sensitivity to CO gas at a relatively low temperature (125 °C).

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Synergetic Accrual of Lamellar Nanohybrids for Band-Selective Photodetection

Cited by 11 publications

References 35 publications

π-Conjugated Amine–ZnO Nanohybrids for the Selective Detection of CO₂ Gas at Room Temperature

π-Conjugated Amine–ZnO Nanohybrids for the Selective Detection of CO₂ Gas at Room Temperature

Trap assisted charge multiplication enhanced photoresponse of Li–P codopedp-ZnO/n-Si heterojunction ultraviolet photodetectors

Organo-di-benzoic-acidified ZnO Nanohybrids for Highly Selective Detection of CO at Low Temperature

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Synergetic Accrual of Lamellar Nanohybrids for Band-Selective Photodetection

Cited by 11 publications

References 35 publications

π-Conjugated Amine–ZnO Nanohybrids for the Selective Detection of CO2 Gas at Room Temperature

π-Conjugated Amine–ZnO Nanohybrids for the Selective Detection of CO2 Gas at Room Temperature

Trap assisted charge multiplication enhanced photoresponse of Li–P codopedp-ZnO/n-Si heterojunction ultraviolet photodetectors

Organo-di-benzoic-acidified ZnO Nanohybrids for Highly Selective Detection of CO at Low Temperature

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Product

Resources

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π-Conjugated Amine–ZnO Nanohybrids for the Selective Detection of CO₂ Gas at Room Temperature

π-Conjugated Amine–ZnO Nanohybrids for the Selective Detection of CO₂ Gas at Room Temperature