Comprehensive analysis of the effects of bending strain on GFET on ultra-flat flexible PI substrate using varnish PI

Micro & nano letters

article

Kangmin Kim¹  Seulgi Park¹  Ohyun Kim¹ 

[1] Department of Electrical Engineering, Pohang University of Science and Technology

关键词: carrier mobility;    energy gap;    field effect transistors;    bending;    Raman spectra;    graphene;    carrier density;    annealing;    surface roughness;    graphene devices;    internal stresses;    GFET;    varnish PI;    PI film;    uniaxial strain;    graphene field-effect transistors;    ultraflat surface;    surface roughness;    energy bandgap;    bending strain;    ultraflat flexible PI substrate;    ultraflat flexible polyimide film;    symmetric atomic structure;    two-dimensional peak;    Raman spectrum;    current on-off ratio;    carrier concentration;    carrier mobility;    electrical resistivity;    thermal annealing;    temperature 200.0 degC;    C;   

DOI  :  10.1049/mnl.2018.5448

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

To study the serum IGF-1 level for prediction of growth hormone deficiency and its role in the diagnosis of short stature in children and adolescents. A  study was conducted on forty four (44) short children with growth hormone deficiency. Children were classified into Group I thirty five (35) prepubertal children and Group II (9) patients who entered puberty. In addition to forty (40) apparently healthy children as control group, also were divided into group I control(29) prepubertal &group II (11) pubertal  . IGF-1,GH ,Thyroid function ,serology for celiac disease , Hb level ,bone age  were done for all patients. IGF-1 and basal GH level (without provocative test) were done for control . There was a significant low difference between the serum IGF-1 level in the patients of group I in comparison to their serum level in control group I      {(90.98±23.69)  (121.83±23.69) (p<0.05)} . While there was no such  difference between the serum IGF-1 level in the patients of group II in comparison to their serum  level in control group II   {(184.59±196.52) (285.91±68.89) (p<0.05)}. This study shows that IGF-1 level is low compared to control in short GH deficient children who did not enter puberty, while it is less significant in children and adolescents who entered puberty. So IGF-1 is a suitable parameter to predict GH deficiency in short prepubertal children in whom GH deficiency was found by GH provocative testing. But this test is less reliable in children who entered puberty.

【 授权许可】

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