scholarly journals Hybrid Top-Down/Bottom-Up Fabrication of Regular Arrays of AlN Nanorods for Deep-UV Core-Shell LEDs

2017 ◽  
Vol 255 (5) ◽  
pp. 1700445 ◽  
Author(s):  
Pierre-Marie Coulon ◽  
Gunnar Kusch ◽  
Emmanuel D. Le Boulbar ◽  
Pierre Chausse ◽  
Christopher Bryce ◽  
...  
Keyword(s):  
Core Shell ◽  
Top Down ◽  
Bottom Up ◽  
Deep Uv ◽  
Regular Arrays

scholarly journals Creation of regular arrays of faceted AlN nanostructures via a combined top-down, bottom-up approach

2020 ◽  
Vol 548 ◽  
pp. 125824
Author(s):  
R. Armstrong ◽  
P-M. Coulon ◽  
P. Bozinakis ◽  
R.W. Martin ◽  
P.A. Shields
Keyword(s):  
Top Down ◽  
Bottom Up ◽  
Regular Arrays

Structural and optical nanoscale analysis of GaN core–shell microrod arrays fabricated by combined top-down and bottom-up process on Si(111)

2016 ◽  
Vol 55 (5S) ◽  
pp. 05FF02 ◽  
Author(s):  
Marcus Müller ◽  
Gordon Schmidt ◽  
Sebastian Metzner ◽  
Peter Veit ◽  
Frank Bertram ◽  
...  
Keyword(s):  
Core Shell ◽  
Top Down ◽  
Bottom Up

scholarly journals Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3158
Author(s):  
Mohammad S. Almomani ◽  
Naser M. Ahmed ◽  
Marzaini Rashid ◽  
M. K. M. Ali ◽  
H. Akhdar ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Confinement ◽  
Emission Spectra ◽  
Core Shell ◽  
Porous Si ◽  
Top Down ◽  
Bottom Up ◽  
Orange Yellow ◽  
Red Luminescence ◽  
Bright Blue

Despite many dedicated efforts, the fabrication of high-quality ZnO-incorporated Zinc@Silicon (Zn@Si) core–shell quantum dots (ZnSiQDs) with customized properties remains challenging. In this study, we report a new record for the brightness enhancement of ZnSiQDs prepared via a unified top-down and bottom-up strategy. The top-down approach was used to produce ZnSiQDs with uniform sizes and shapes, followed by the bottom-up method for their re-growth. The influence of various NH4OH contents (15 to 25 µL) on the morphology and optical characteristics of ZnSiQDs was investigated. The ZnSiQDs were obtained from the electrochemically etched porous Si (PSi) with Zn inclusion (ZnPSi), followed by the electropolishing and sonication in acetone. EFTEM micrographs of the samples prepared without and with NH4OH revealed the existence of spherical ZnSiQDs with a mean diameter of 1.22 to 7.4 nm, respectively. The emission spectra of the ZnSiQDs (excited by 365 nm) exhibited bright blue, green, orange-yellow, and red luminescence, indicating the uniform morphology related to the strong quantum confinement ZnSiQDs. In addition, the absorption and emission of the ZnSiQDs prepared with NH4OH were enhanced by 198.8% and 132.6%, respectively. The bandgap of the ZnSiQDs conditioned without and with NH4OH was approximately 3.6 and 2.3 eV, respectively.

Psychology and Culture: Top Down Versus Bottom Up?

PsycCRITIQUES ◽  
2005 ◽  
Vol 50 (19) ◽  
Author(s):  
Michael Cole
Keyword(s):  
Top Down ◽  
Bottom Up

Optimalisasi Ekonomi Syariah Untuk Peningkatan Kesejahteraan Masyarakat Dalam Pengentasan Kemiskinan Mewujudkan Goodgovernance

2019 ◽  
Vol 4 (1) ◽  
pp. 19
Author(s):  
Sadari Sadari ◽  
Nurhidayat Nurhidayat ◽  
Rafiqah Rafiqah
Keyword(s):  
Top Down ◽  
Bottom Up

Humanisme religius telah mengantarkan pada era kesadaran bahwa peradaban manusia harus memiliki dua arus yang saling menunjang. Selama ini arus balik dalam bidang ekonomi hanya menonjolkan arus balik vertikal atas kebawah (model top down) yang didominasi oleh sistem ekonomi kapitalis dan sosialis, sedangkan di sisi lain mengesampingkan arus balik vertikal dari bawah ke atas (model bottom up) yang didominasi oleh sistem ekonomi syariah, sehingga dampaknya adalah adanya kesenjangan ekonomi yang sangat tajam. Paper ini mewujudkan peran penting, yakni menghubungkan dua arus tersebut secara timbal-balik, yakni mempertemukan arus pertama dengan arus balik kedua, sehingga akan menghasilkan dampak yang positif, progresif, kreatif dan produktif, kemudian pada akhirnya akan dapat meng-optomal-kan ekonomi syariah untuk menciptakan goodgovernance, post goodgovernance secara berkelanjutan, tentunya dengan bantuan peran media kontemporer yang kian update. Ekonomi syariah juga merupakan pilar dan nilai dasar, dari sikap keyakinan dan sikap rasionalitas untuk sanggup menciptakan terwujudnya pemberdayaan dan kesejahteraan sekaligus pengentasan kemiskinan dalam masyarakat di Indonesia.

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