2022
DOI: 10.3390/chemosensors10020039
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ZnO Transducers for Photoluminescence-Based Biosensors: A Review

Abstract: Zinc oxide (ZnO) is a wide bandgap semiconductor material that has been widely explored for countless applications, including in biosensing. Among its interesting properties, its remarkable photoluminescence (PL), which typically exhibits an intense signal at room temperature (RT), arises as an extremely appealing alternative transduction approach due to the high sensitivity of its surface properties, providing high sensitivity and selectivity to the sensors relying on luminescence output. Therefore, even thou… Show more

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Cited by 22 publications
(10 citation statements)
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“…The visible emission bands from the fluorescence spectrum of ZnO are directly related to the presence of crystalline defects and are named deep level emission (DLE). In pure samples, a series of defects might exist: zinc vacancies (V Zn ), zinc interstitials (Zn i ), oxygen vacancies (V O ), oxygen interstitials (O i ), or oxygen anti-sites (O Zn ) [ 53 , 54 ]. The emission in the violet region is usually assigned to the V Zn while the blue emission (457 nm) is attributed to the transitions from Zn + I to valence band (VB).…”
Section: Resultsmentioning
confidence: 99%
“…The visible emission bands from the fluorescence spectrum of ZnO are directly related to the presence of crystalline defects and are named deep level emission (DLE). In pure samples, a series of defects might exist: zinc vacancies (V Zn ), zinc interstitials (Zn i ), oxygen vacancies (V O ), oxygen interstitials (O i ), or oxygen anti-sites (O Zn ) [ 53 , 54 ]. The emission in the violet region is usually assigned to the V Zn while the blue emission (457 nm) is attributed to the transitions from Zn + I to valence band (VB).…”
Section: Resultsmentioning
confidence: 99%
“…The properties of ZnO-based materials can be tailored and enhanced by controlling and optimizing several parameters (solution concentration [ 11 ], dopant level [ 12 , 13 ], synthesis [ 14 , 15 , 16 , 17 ], and annealing temperature [ 18 ] or pH [ 19 ]). In the last decade, the development of nanostructures with various morphologies [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ] such as: nanowires, nanorods (NR), nanoflowers, nanosheets, nanobelts, nanoneedles, nanoplates, has gained tremendous attention, being used in biological applications [ 8 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]: bioimaging, biosensing, antibacterial and drug delivery agents. In particular, ZnO thin films have optical (photoluminescence) [ 33 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ], electrical (thermoelectric [ 43 , 44 , 45 , 46 ], piezoelectric [ 47 , 48 , 49 , 50 , 51 , 52 , 53 ]) and biological (antimicrobial [ 54 , 55 , …”
Section: Introductionmentioning
confidence: 99%
“…[2]. In particular, ZnO thin films are used for the development of optoelectronic [3], transparent conductive oxides (TCOs) [4] and piezoelectric devices [5], photovoltaics [6], photocatalysts [7], gas sensors [8][9][10] or biosensors [11][12][13] due to their impressive optical (photoluminescence-PL) [14][15][16], electrical (thermoelectric, piezoelectric) [17][18][19][20] and biological (antimicrobial and antibacterial) [21][22][23] properties. It is well known that by doping, the aforementioned properties of ZnO thin films can be significantly improved.…”
Section: Introductionmentioning
confidence: 99%