24小时热门版块排行榜    

查看: 703  |  回复: 1

小鸟蘑菇

木虫 (小有名气)

[求助] PEG钝化制备上转化的GQDs

按照文献用PEG钝化GQDs表面,制备具有上转化发光性质的GQDs,方法附后。
有谁做过的,能不能帮忙看下,下面几个问题:
1. 用Na2CO3调节pH为8时,Na2CO3的浓度和加入量有没有影响?要用多少呢?
2. 还原用的水合肼量和浓度怎么控制呢?
3. 用0.22um滤膜过滤那步,直接离心分离、取上清液,也可以吧?
4. 最后一步的透析,完成后得到的应该还是GQDs的溶液吧,那怎么确定浓度呢?

不胜感激!

The preparation of GQDs with an oligomeric PEG1500N as the surface passivation
agent. GO were prepared from natural graphite powder by a modified Hummers
method. The sample GO(0.05 g)was treated in an aqueous nitric acid solution
(up to 2.6 M) (40 mL)with 70 oC reflux for 24 h. After cooling to room temperature, the suspension was under mild ultrasonication. The pH was tuned to 8 with Na2CO3. The suspension was filtered through a 0.22 μm microporous membrane to remove the large tracts of GO. In a typical reaction, PEG1500N (2g) was mixed with the cutting GO solution, and the mixture was substantially mixed. The mixture solution was heated at 120 oC for 24 h. And then, graphene oxide is reduced by hydrazine hydrate at 100 oC for 24 h. After cooling to room temperature, the resulting solution was filtered and a yellow solution was separated. So, the mixture solution was further dialyzed in a dialysis bag (retained molecular weight: 14,000 Da) for 7~10 days and GQDs were then strongly fluorescent.
回复此楼
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

小鸟蘑菇

木虫 (小有名气)

木虫现在人气不旺啊想收个回复好难
2楼2013-05-28 14:10:55
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 小鸟蘑菇 的主题更新
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 0703化学调剂 +9 妮妮ninicgb 2026-03-15 13/650 2026-03-19 22:13 by l1006507827
[教师之家] 焦虑 +9 水冰月月野兔 2026-03-13 13/650 2026-03-19 09:50 by otani
[考研] 328求调剂,英语六级551,有科研经历 +3 生物工程调剂 2026-03-17 7/350 2026-03-18 20:41 by Wangjingyue
[考研] 344求调剂 +6 knight344 2026-03-16 7/350 2026-03-18 20:13 by walc
[考研] 295求调剂 +3 一志愿京区211 2026-03-18 5/250 2026-03-18 17:03 by zhaoqian0518
[考研] 311求调剂 +6 26研0 2026-03-15 6/300 2026-03-18 14:43 by haxia
[考研] 材料与化工一志愿南昌大学327求调剂推荐 +8 Ncdx123456 2026-03-13 9/450 2026-03-18 14:40 by haxia
[考研] 297求调剂 +8 戏精丹丹丹 2026-03-17 8/400 2026-03-18 14:30 by laoshidan
[考研] 331求调剂(0703有机化学 +7 ZY-05 2026-03-13 8/400 2026-03-18 14:13 by 007_lilei
[考研] 材料,纺织,生物(0856、0710),化学招生啦 +3 Eember. 2026-03-17 9/450 2026-03-18 10:28 by Eember.
[考研] 0703化学336分求调剂 +6 zbzihdhd 2026-03-15 7/350 2026-03-18 09:53 by zhukairuo
[硕博家园] 湖北工业大学 生命科学与健康学院-课题组招收2026级食品/生物方向硕士 +3 1喜春8 2026-03-17 5/250 2026-03-17 17:18 by ber川cool子
[考研] 一志愿南京大学,080500材料科学与工程,调剂 +4 Jy? 2026-03-16 4/200 2026-03-17 11:02 by gaoqiong
[考研] 283求调剂 +3 听风就是雨; 2026-03-16 3/150 2026-03-17 07:41 by 热情沙漠
[考研] 304求调剂 +4 ahbd 2026-03-14 4/200 2026-03-16 16:48 by 我的船我的海
[考研] 本科南京大学一志愿川大药学327 +3 麦田耕者 2026-03-14 3/150 2026-03-14 20:04 by 外星文明
[基金申请] 现在如何回避去年的某一个专家,不知道名字 +3 zk200107 2026-03-12 6/300 2026-03-14 17:13 by zk200107
[考研] 328求调剂 +3 5201314Lsy! 2026-03-13 6/300 2026-03-14 15:31 by hyswxzs
[考研] 一志愿哈工大材料324分求调剂 +5 闫旭东 2026-03-14 5/250 2026-03-14 14:53 by 木瓜膏
[考博] 福州大学杨黄浩课题组招收2026年专业学位博士研究生,2026.03.20截止 +3 Xiangyu_ou 2026-03-12 3/150 2026-03-13 09:36 by duanwu655
信息提示
请填处理意见