Microwave-assisted polyol synthesis of aluminium- and indium-doped ZnO nanocrystals

Hammarberg, Elin; Prodi-Schwab, Anna; Feldmann, Claus

doi:10.1016/j.jcis.2009.03.010

Cited by 92 publications

(70 citation statements)

References 47 publications

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“…Therefore, complementary information is obtained from FTIR absorption spectra which can reveal the presence or absence of free charge carriers in the powder. 3,39 FTIR spectra are recorded of all the powders of the nanoequiaxed as well as the nanorod series to evaluate the presence of free charge carriers indicative for substitutional doping. 3,19,39 All the spectra of the nanorod series (Al doped as well as pure ZnO) exhibit the same features when compared with the FTIR absorption spectrum of undoped ZnO (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…plastics). [31][32][33][34][35][36] A variety of methods such as coprecipitation, 37 sol-gel, 38 microwave assisted polyol route, 39 thermal decomposition synthesis 40 and hydro/solvothermal synthesis 41 as a solvent and reactant. Because of the versatile character of these routes for ZnO, they were selected as a basis for the current work in order to obtain Al-doped ZnO nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

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Relation between synthesis conditions, dopant position and charge carriers in aluminium-doped ZnO nanoparticles

et al. 2013

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relation between synthesis conditions, dopant position and charge carriers in aluminium-doped ZnO nanoparticles

et al. 2013

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“…It has been shown that, by varying the concentration of Al substitutional ions between 0 and 8 %, it is possible to tune the plasmon resonance between 3 and 10 µm (3200 to 1000 cm --1 ), while keeping the NCs transparent in the visible range [60]. Hammarberg et al [57] reported a synthesis strategy to realize indium doped zinc oxide NCs, while Cohn et al described a synthesis route in which zinc could be substituted by manganese [78]. An additional way, besides doping, to make ZnO NCs conductive is to photochemically charge them [79].…”

Section: Methodsmentioning

confidence: 99%

Plasmonics in heavily-doped semiconductor nanocrystals

et al. 2013

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Abstract:Heavily--doped semiconductor nanocrystals characterized by a tunable plasmonic band have been gaining increasing attention recently. Herein, we introduce this type of materials focusing on their structural and photo--physical properties. Beside their continuous--wave plasmonic response, depicted both theoretically and experimentally, we also review recent results on their transient ultrafast response. This was successfully interpreted by adapting models of the ultrafast response of noble metal nanoparticles. IntroductionThe optical features exhibited by metallic nano--systems have been the subject of an intensive theoretical and experimental research, resulting in applications in several fields, from surface--enhanced spectroscopy, to biological and chemical nano--sensing [1]. Such developments are primarily due to the localized surface plasmon resonance (LSPR), which results in intense optical absorption and scattering as well as sub--wavelength localization of large electrical fields in the vicinity of the nano--object [2--10]. The plasmonic response of these metallic nanostructures is strongly dependent on the type of metal of which they are made, on the dielectric function of the surrounding medium, on the particle shape and, even if to a lesser extent, on the particle size. Nanoparticles of several metals, such as Ag, Au, Cu and Pt, exhibiting plasmonic response in the ultraviolet and in the visible regions of the spectrum have been successfully synthesized in the past decades [11--15]. Elongated metallic nanoparticles have been shown to exhibit plasmonic response in the near infrared, due to excitation of the longitudinal plasmon mode [16--18]. It has been recently reported that direct optical excitation of the metal by intense femtosecond laser pulses induces an ultra--fast modulation of the plasmonic resonance, which can be used for ultra--fast modulation of signals [19], paving the way to ultrafast active plasmonics. A quantitative investigation of such dynamical features is therefore crucial for the development of a new generation of ultra--fast nano--devices. Pump--probe spectroscopy, giving access to the electronic excitation and subsequent relaxation processes in the material, is to date the most suitable tool for the experimental study of the ultrafast dynamical features exhibited by plasmonic nanostructures. So far, several noble metal structures have been investigated, including spherical nanoparticles [20--22] and nanorods [23], revealing that the physical processes of excitation and relaxation are actually similar to those observed in bulk (i.e. in thin films) metallic systems, that are the electron--electron, the electron--phonon and the phonon--phonon interactions [24,25].

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“…In combination with microwave heating these routes provide a fast and energy efficient synthesis methodology to metal oxide nanoparticles. As a matter of fact, a great variety of nanoparticles, including ZnO [29][30][31], doped zinc oxide [32,33], CoO [30], MnO/Mn 3 O 4 [30] or BaTiO 3 [30] are accessible in a very controlled manner at moderate temperatures using microwave-assisted nonaqueous solgel chemistry. Microwave heating is beneficial for nonaqueous sol-gel chemistry in many ways.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous formation of ferrite nanocrystals and deposition of thin films via a microwave-assisted nonaqueous sol–gel process

Bilecka

Kubli

Amstad

et al. 2010

J Sol-Gel Sci Technol

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Combination of the surfactant-free nonaqueous sol-gel approach with the microwave technique makes it possible to synthesize Fe 3 O 4 , CoFe 2 O 4 , MnFe 2 O 4 , and NiFe 2 O 4 nanoparticles of about 5-6 nm and with high crystallinity and good morphological uniformity. The synthesis involves the reaction of metal acetates or acetylacetonates as precursors with benzyl alcohol at 170°C under microwave irradiation of 12 min. Immersion of glass substrates in the reaction solution results in the deposition of homogeneous metal ferrite films whose thickness can be adjusted through the precursor concentration. If preformed nickel nanoparticles are used as a type of curved substrate, the ferrite nanoparticles coat the seeds and form core-shell structures. These results extend the microwave-assisted nonaqueous sol-gel approach beyond the simple synthesis of nanoparticles to the preparation of thin films on flat or curved substrates.

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Microwave-assisted polyol synthesis of aluminium- and indium-doped ZnO nanocrystals

Cited by 92 publications

References 47 publications

Relation between synthesis conditions, dopant position and charge carriers in aluminium-doped ZnO nanoparticles

Relation between synthesis conditions, dopant position and charge carriers in aluminium-doped ZnO nanoparticles

Plasmonics in heavily-doped semiconductor nanocrystals

Simultaneous formation of ferrite nanocrystals and deposition of thin films via a microwave-assisted nonaqueous sol–gel process

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